Duskmourn: House of Horror Commander

Legendary Enchantment Creature — Horror

Arvinox isn't a creature unless you control three or more permanents you don't own.
At the beginning of your end step, exile the bottom card of each opponent's library face down. For as long as those cards remain exiled, you may look at them, you may cast permanent spells from among them, and you may spend mana as though it were mana of any color to cast those spells.

Arvinox, the Mind Flail

Fallout

Artifact — Bobblehead

{T}: Add one mana of any color.
{3}, {T}: Put X +1/+1 counters on target creature, where X is the number of Bobbleheads you control. Activate only as a sorcery.

Strength Bobblehead

Sorcery

You may put two +1/+1 counters on a creature you control. Then all creatures get -4/-4 until end of turn.

Finality

Return up to two target creature cards from your graveyard to your hand.

Find

Basic Land — Swamp

Swamp

Forest

Gilt-Leaf Alchemist

Basic Land — Forest

Warhammer 40,000 Commander

Creature — Tyranid

Ravenous (This creature enters with X +1/+1 counters on it. If X is 5 or more, draw a card when it enters.)
Endless Swarm — Whenever a land you control enters, you may pay {2}{G}. If you do, return this card from your graveyard to your hand.

Hormagaunt Horde

Tyranid

Termagant Swarm

Ravenous (This creature enters with X +1/+1 counters on it. If X is 5 or more, draw a card when it enters.)
Death Frenzy — When this creature dies, create a number of 1/1 green Tyranid creature tokens equal to this creature's power.

Tyranid Gargoyle

Gargoyle Flock

Creature — Tyranid Gargoyle

Flying
Skyswarm — At the beginning of your end step, if a creature entered the battlefield under your control this turn, create a 1/1 blue Tyranid Gargoyle creature token with flying.

Entrapment Maneuver

Soldier

Instant

Target player sacrifices an attacking creature of their choice. You create X 1/1 white Soldier creature tokens, where X is that creature's toughness.

Go for the Throat

Artifact

{T}: Add {C}.
{T}: Add {B} or {R}. This artifact deals 1 damage to you.