Corvus Corax

Flying, Hexproof

{t}: Primarch of the Raven Guard -
Pay {x} and summon {x}Raven Guard Astartes tokens with flying & first strike. You may not use this ability if Corax is the only non-token creature you control.

If Corax is your only non-token permanent you may {t}{2} to destroy all target opponents creatures with a power less than Corax. This cannot be prevented. Until your next turn you can not attack or deal damage of any type.