Vythmoss, Horror Devourer

Trample, Lifelink
Vythmoss, Horror Devourer costs {1} less to cast for each elemental, beast, treefolk, and horror in your graveyard.
When a elemental, beast, treefolk, and horror you control deals damage to an opponent, they put the top card of their library into their graveyard. You may cast that spell this turn without paying its mana costs.