Soooooooo...are you asking us to create a Kavu that forces discards? I'll give it a go:
Devouring Kavu
2RB
Creature - Kavu
Whenever Mindwarp Kavu deals caombat damage to a player, that player chooses and discards a card from their hand.
Sacrifice Devouring Kavu: destroy target creature or land.
2/3
And in the end, it bit off more than it could chew...