Legendary Hero Decks

Cannot be Normal Summoned/Set. When you Normal Summon a Warrior monster: You can Special Summon this card from your hand. Cannot be used as Synchro Material.

Blue Mountain Butterspy

Battle Pack 3: Monster League

Target 1 face-up Attack Position monster on the field; change it to face-up Defense Position, also any damage you take for the rest of this turn is halved.

Butterspy Protection

War of the Giants Reinforcements

When another monster you control inflicts battle damage to your opponent: Target 1 face-up monster your opponent controls; it loses ATK equal to the battle damage inflicted.

Swallowtail Butterspy

Number Hunters

2 Level 4 "Butterspy" monsters
You can detach 1 Xyz Material from this card; return all monsters on the field to the hand, then inflict 300 damage to each player for each card returned to their hand.

Photon Alexandra Queen

Galactic Overlord

When this card is sent from the field to the Graveyard: You can Special Summon 1 Level 4 or lower "Butterspy" monster from your Deck.

Moonlit Papillon

Once per turn, when the battle position of an opponent's monster(s) is changed (except during the Damage Step): You can target one of those monsters; it loses 1000 ATK and DEF.