Goblin Trainer

At the beginning of your upkeep, another target creature you control gets either -2/+2, +2/-2, or +1/+1 until end of turn.
"Yeah you got him kid! Now jab, jab, block, duck,
run away, run back, kick him in the shins, stab him with your pointy thing, and give him the ole one, two. Yeah just listen to me and we'll be going to the big times for sure; kid you're gonna be legend!"
-Sportstick the Goblin