Zesh Nadish, Smasher of Myr

Decoy (You may have this creature assign combat
damage as though it wasn't blocked.)
At the beginning of combat on your turn, another target creature you control gets +X/+X until end
of turn, where X is that creatures power.
At the beginning of combat on each opponents
turn, target creature that player controls gets
-X/-X until end of turn, where X is half of that
creatures toughness rounded down.