Modern, +"face down", +!"face up", +!aside, +!front, +!exile, +!remove (3)
As Ixidron enters, turn all other nontoken creatures face down. (They're 2/2 creatures.)
Ixidron's power and toughness are each equal to the number of face-down creatures on the battlefield.
Face-down creature spells you cast cost less to cast.
: Turn Obscuring Aether face down. (It becomes a 2/2 creature.)
+1: Draw a card.
0: Until your next turn, target artifact you control becomes a 5/5 creature in addition to its other types.
−7: Put any number of cards from your hand onto the battlefield face down. They're 5/5 artifact creatures.
Gatherer works better in the Companion app!