mtg.wtf

You may cast spells from your hand without paying their mana costs.

Improvise
Destroy all nonartifact creatures.

Exile the top card of your library. If it's a permanent card, you may put it onto the battlefield. If you do, repeat this process.

If Primeval Spawn would enter and it wasn't cast or no mana was spent to cast it, exile it instead.
Vigilance, trample, lifelink
When Primeval Spawn leaves the battlefield, exile the top ten cards of your library. You may cast any number of spells with total mana value 10 or less from among them without paying their mana costs.

Protection from everything
If Progenitus would be put into a graveyard from anywhere, reveal Progenitus and shuffle it into its owner's library instead.

Other Scarecrow creatures you control get +1/+1.
Whenever another Scarecrow you control enters, destroy target permanent.

Prototype {3}{G}{G} — 3/5
Reach, trample

Destroy all nonartifact permanents.

Annihilator 1
{4}: Create two 0/1 colorless Eldrazi Spawn creature tokens. They have "Sacrifice this creature: Add {C}."
{20}: Cast any number of Eldrazi spells from among cards you own outside the game without paying their mana costs.

Create X 1/1 white Pegasus creature tokens with flying, where X is your life total.

Domain — This spell costs {1} less to cast for each basic land type among lands you control.
Trample

Each player shuffles their hand, graveyard, and all permanents they own into their library, then draws seven cards. Each player's life total becomes 7.

Ward—You get two poison counters.
Annihilator X, where X is the total number of poison counters your opponents have.
When you cast That Which Was Compleated, you may put a card an opponent owns in exile into their graveyard. If you do, they get two poison counters.

Those Who Came Before — This spell costs {1} less to cast for each historic card in your graveyard.
Exile any number of historic cards from your graveyard with total mana value 30 or greater: You get an emblem with "Creatures you control have base power and toughness 9/9."

Target player takes two extra turns after this one.

Vigilance
Ward—Sacrifice a permanent with mana value 1 or greater.
{T}: Create a 10/10 colorless Eldrazi creature token.

When you cast this spell, exile two target permanents.
Indestructible
Whenever Ulamog, the Ceaseless Hunger attacks, defending player exiles the top twenty cards of their library.

When you cast this spell, target opponent exiles the top half of their library, rounded up.
Ward—Sacrifice two permanents.
Ulamog, the Defiler enters with a number of +1/+1 counters on it equal to the greatest mana value among cards in exile.
Ulamog has annihilator X, where X is the number of +1/+1 counters on it.

Prototype {2}{G}{G} — 3/3
When Woodcaller Automaton enters, if you cast it, untap target land you control. It becomes a Treefolk creature with haste and base power and toughness equal to Woodcaller Automaton's power and toughness. It's still a land.

When Apex Altisaur enters, it fights up to one target creature you don't control.
Enrage — Whenever Apex Altisaur is dealt damage, it fights up to one target creature you don't control.

Convoke
Hexproof

When you cast this spell, you may return target creature card from your graveyard to the battlefield.
Annihilator 2

This spell costs {1} less to cast for each creature on the battlefield.
Blasphemous Act deals 13 damage to each creature.

Artifact offering
Flying, double strike
Creatures attacking your opponents have double strike.

Flying
Creatures can't attack you.