Ilharg, the Raze-Boar
Whenever Ilharg, the Raze-Boar attacks, you may put a creature card from your hand onto the battlefield tapped and attacking. Return that creature to your hand at the beginning of the next end step.
When Ilharg, the Raze-Boar dies or is put into exile from the battlefield, you may put it into its owner's library third from the top.
Oh, man, and with Rhythm out, you can just choose to give whatever creature Ilharg sneaks out the +1/+1 counter for some extra punishment. Worst-case scenario, he cheapens the cost to put out Ghalta next turn, and you sneak out another heavyweight from hand when you attack with both.
He'd also work well with Tetzimoc. Put prey counters on things, drop Tetzy when you attack, blow up anything with a prey counter on it, bounce Tetz back to hand to do it again.
And Rhythm of the Wild