Corrupted Key

Double any effect that doubles. (It quadruples.)

Upgrade (This creature enters covering another artifact you control. If it can't, exile it. Ignore the artifact it's covering. Anywhere this card goes, cards underneath it also go. It has haste.)

When Form of the Mulldrifter enters, draw two cards. You may cast creature cards from your hand as though they were the card Mulldrifter. (You can still evoke this way. They're Mulldrifters.)

At the beginning of your combat step, tap Aggressive Crag. T: Add R or W.

Target instant or sorcery spell becomes a copy of Lightning Bolt. Its controller may choose new targets for it.

Five Kids in a Trenchcoat counts as five creatures for spells and effects that count the number of creatures you control.

3, T: Until end of turn, you may play one basic Plains card from outside the game.

Everlasting Lich can't block. Everlasting Lich can't die. (This creature has indestructible, can't be sacrificed, and doesn't go to the graveyard for having 0 toughness.)