Gruul Beastmaster

Riot (This creature enters the battlefield with your
choice of a +1/+1 counter or haste.)
Whenever Gruul Beastmaster attacks, another
target creature you control gets +X/+0 until end
of turn, where X is Gruul Beastmaster's power.
—
"This is bigger than your suburbs! My word is
global! You've got another thing comin'if you're
thinkin' it's all vocal!" -MC Timmy
(Lyrics From: 'Movement To The Message')