Demrik, blessed by Vaznik

Trample, haste
This spell costs {1} less to cast for each curse enchantment in any players graveyard.
At the beginning of combat on your turn, any opponent may sacrifice a creature.
If a player does, tap Demrik, blessed by Vaznik
you draw a card and put a +1 +1 counter on
Demrik, blessed by Vaznik.