Ultimate Tournament Pack 1

2 Level 4 monsters
During either player's turn, when a Level 5 or higher monster would be Special Summoned: You can detach 1 Xyz Material from this card; negate the Special Summon, and if you do, destroy it.

Steelswarm Roach

Legendary Modern Decks 2026

2 Level 4 monsters
Once per chain, during your Main Phase or your opponent's Battle Phase, if your opponent has more total cards in their hand and field than you do (Quick Effect): You can detach 1 material from this card; destroy all other cards on the field, also your opponent takes no further damage this turn.

Evilswarm Exciton Knight

Quarter Century Stampede

2 Level 4 "lswarm" monsters
While this card has Xyz Material, Level 5 or higher monsters cannot be Special Summoned. Once per turn: You can detach 1 Xyz Material from this card; add 1 "Infestation" Spell/Trap Card from your Deck to your hand.

Evilswarm Ophion

Crossover Breakers

3 Level 4 monsters
Once per turn: You can detach 1 Xyz Material from this card, then activate 1 of these effects. Each effect can only be used once while this card is face-up on the field.
● Target 1 card your opponent controls; return that target to the hand.
● Send 1 random card from your opponent's hand to the Graveyard.
● Target 1 card in your opponent's Graveyard; banish that target.

Evilswarm Ouroboros

Egyptian God Deck: Obelisk the Tormentor

If your opponent controls more monsters than you do, you can Special Summon this card (from your hand).

Evilswarm Mandragora

Up to twice per turn: You can banish 1 monster from your Graveyard; this card gains 300 ATK until the end of your opponent's turn.

Evilswarm Salamandra

Legendary Hero Decks

2 Level 4 DARK monsters
When your opponent Special Summons a monster(s) (except during the Damage Step): You can detach 1 material from this card; change that Special Summoned monster(s) to face-down Defense Position.

Evilswarm Nightmare

2 Level 4 DARK monsters
Once per turn (Quick Effect): You can detach 1 material from this card; this face-up card is unaffected by other monster effects this turn.

Evilswarm Thanatos

Extreme Force Special Edition

2 "lswarm" monsters
While this card is in the Extra Monster Zone, if a monster would be Special Summoned from the Extra Deck to the Main Monster Zone, it must be Summoned in the zone this card points to. While this card points to a monster, neither player can target it with card effects, also it cannot be destroyed by battle or card effects. Once per turn, when a monster(s) on the field is destroyed by battle or by card effect: You can Special Summon Level 4 or lower "lswarm" monsters from your Deck in Defense Position, up to the number destroyed.

Steelswarm Origin

Rise of the True Dragons Structure Deck

If this face-up card you control is destroyed by your opponent's card (by battle or card effect) and sent to your Graveyard: Target 1 Special Summoned Level 5 or higher monster on the field; destroy that target.

Evilswarm Zahak

2014 Mega-Tin Mega Pack

You can only use each effect of "Evilswarm Kerykeion" once per turn. While this card is in the Graveyard, if it was sent there this turn, you can Normal Summon 1 "lswarm" monster for 1 less Tribute.
You can banish 1 "lswarm" monster from your Graveyard, then target 1 "lswarm" monster in your Graveyard; add that target to your hand, also, this card gains the following effect.
● This turn: You can activate this effect; Normal Summon 1 "lswarm" monster.

Evilswarm Kerykeion

Battle Pack 3: Monster League

You can Tribute this card, then target 1 Spell/Trap Card your opponent controls; destroy that target.

Evilswarm Ketos

You can Tribute this card, then target 1 face-up monster your opponent controls; destroy that target.

Evilswarm O'lantern

During either player's turn, when a card or effect is activated (except during the Damage Step): You can banish this card you control. During the next Standby Phase, return this card banished by this effect to the field, and if you do, it gains 300 ATK. You can only use this effect of "Evilswarm Thunderbird" once per turn.

Evilswarm Thunderbird

War of the Giants Reinforcements

.ytilaer a maerd rieht ekam thgim yeht taht os ydob a rof gninraey ,sluos mrawsleetS gniregnil fo sthguoht eht era esehT "!etanimretxE !etacidarE !etanimilE"

Evilswarm Heliotrope

If this card battles a monster, after damage calculation: Negate the effects of that monster (including in the Graveyard).

Evilswarm Obliviwisp

Hidden Arsenal 7: Knight of Stars

FLIP: Target 1 Special Summoned monster on the field; shuffle that target into the Deck.

Evilswarm Azzathoth

2 Level 4 "lswarm" monsters
Once per turn: You can detach 1 Xyz Material from this card to target 1 face-up monster your opponent controls; discard 1 "lswarm" monster, and if you do, take control of that opponent's monster.

Evilswarm Bahamut

During the turn this card was Normal Summoned, you can Normal Summon 1 "lswarm" monster in addition to your Normal Summon/Set. (You can only gain this effect once per turn.)

Evilswarm Castor

Cannot be Special Summoned. When this card leaves the field because of your opponent's card (either by battle or by card effect): You can target 1 face-up monster your opponent controls; take control of that target until your next End Phase.

Evilswarm Coppelia

Once per turn: You can target 1 Level 5 or higher non-DARK monster on the field; destroy that target.

Evilswarm Golem

FLIP: Target 1 face-up card your opponent controls; return that target to the hand.

Evilswarm Hraesvelg

Hidden Arsenal 6: Omega Xyz

This card can be treated as 2 Tributes for the Tribute Summon of a "Steelswarm" monster.

Steelswarm Genome

Cannot be Special Summoned. Requires 3 "Steelswarm" Tributes to Normal Summon (cannot be Normal Set). Once per turn: You can pay half your Life Points; destroy all other cards on the field.

Steelswarm Hercules

Once per turn, if this card was Tribute Summoned by Tributing a "Steelswarm" monster(s): You can pay 1000 Life Points to target 1 monster on the field; destroy that target.

Steelswarm Longhorn

While this card is in face-up Attack Position, Special Summoned Level 5 or higher monsters on the field cannot activate their effects.

Steelswarm Sentinel

When this card you control is sent to your Graveyard: Target 1 face-up Ritual, Fusion or Synchro Monster on the field; destroy that target.

Steelswarm Sting

Hidden Arsenal 5: Steelswarm Invasion

When a "Steelswarm" monster is Tribute Summoned face-up by Tributing this card: You can Special Summon 1 Level 4 or lower "Steelswarm" monster from your Deck.

Steelswarm Caller

When this card is Tribute Summoned by Tributing 2 "Steelswarm" monsters: Activate 1 of these effects.
● Destroy all monsters on the field, except this card.
● Destroy all Spell and Trap Cards on the field.

Steelswarm Caucastag

If you control no monsters, you can Special Summon this card (from your hand). While this card is face-up on the field, it cannot be Tributed, except for the Tribute Summon of a "Steelswarm" monster, and cannot be used as a Synchro Material Monster.

Steelswarm Cell

If a "Steelswarm" monster is Tribute Summoned face-up while this card is face-up on the field, you can Normal Summon or Set 1 monster in addition to your Normal Summon or Set that turn.

Steelswarm Gatekeeper

You can Tribute Summon this card in face-up Attack Position by Tributing 1 "Steelswarm" monster. When this card is Tribute Summoned by Tributing a "Steelswarm" monster(s): You can target 1 card your opponent controls; send that target to the Graveyard and gain 1000 Life Points.

Steelswarm Girastag

When this card is Tribute Summoned by Tributing a "Steelswarm" monster: You can pay 1000 Life Points to target up to 2 cards your opponent controls; return those targets to the hand.

Steelswarm Moth

At the start of your Main Phase 1, if you control no Spell/Trap Cards: You can Special Summon this card from your Graveyard. You cannot Special Summon another monster(s) the turn you activate this effect. While this card is face-up on the field, it cannot be Tributed, except for the Tribute Summon of a "Steelswarm" monster, and cannot be used as a Synchro Material Monster.