Ixalos, Gateguard

Costs {x} less for every demon in your graveyard.
First Strike, Trample, Haste, Defender.
When this creature dies, summon a 4/4 Shadow Ixalos.
When an enemy attacks your hero, they pay {2}
Once a small welp among the demons, Ixalos evolved and consumed, until he became the guardian of the demon realms themselves. - Argenon, Historian