Myrah, Emissary of the Abyss

Islandwalk, ward—Sacrifice a nonland permanent.

Each untapped land is an Island in addition to its other land types.

Whenever Myrah deals combat damage to a player, surveil X, where X is the amount of damage dealt. Then if there were six or more cards put into your graveyard this way, create a 6/6 blue and black Serpent creature token with islandwalk.