Légions

{1}{B}, {T}, Sacrifice a creature: Search your library for a Zombie card and a Swamp card, reveal them, put them into your hand, then shuffle.

{1}{U}: Change Riptide Mangler's base power to target creature's power. (This effect lasts indefinitely.)

Mistform Ultimus is every creature type (even if this card isn't on the battlefield).

First strike Provoke (Whenever this creature attacks, you may have target creature defending player controls untap and block it if able.)

Flash When Caller of the Claw enters the battlefield, create a 2/2 green Bear creature token for each nontoken creature put into your graveyard fro...

Flying Morph {6}{R}{R} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.) When Imperial Hel...

Flying When Havoc Demon dies, all creatures get -5/-5 until end of turn.

Defender (This creature can't attack.) {3}: Turn Wall of Deceit face down. Morph {U} (You may cast this card face down as a 2/2 creature for {3}....

Flying {T}: Prevent the next 2 damage that would be dealt to any target this turn.

Whenever a Sliver deals combat damage to a player, its controller may draw a card.

Morph {4}{U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.) When Weaver of Lies is turn...

Covert Operative can't be blocked.

Flying {T}, Tap two untapped Birds you control: Return target permanent to its owner's hand.

{1}: Exile target card from a graveyard.

Flying Whenever Hollow Specter deals combat damage to a player, you may pay {X}. If you do, that player reveals X cards from their hand and you cho...

Defender (This creature can't attack.) Whenever Wall of Hope is dealt damage, you gain that much life.

Flying Cycling {2} ({2}, Discard this card: Draw a card.)

Whenever a Sliver deals combat damage to a creature, destroy that creature. It can't be regenerated.

{T}: The next time a source of your choice would deal damage to you this turn, that damage is dealt to Beacon of Destiny instead.

Cephalid Pathmage can't be blocked. {T}, Sacrifice Cephalid Pathmage: Target creature can't be blocked this turn.

Double strike (This creature deals both first-strike and regular combat damage.)

Morph {6}{R} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.) When Bloodstoke Howler is t...

Dripping Dead can't block. Whenever Dripping Dead deals combat damage to a creature, destroy that creature. It can't be regenerated.

Whenever a Beast becomes blocked, it gets +1/+1 until end of turn for each creature blocking it.