Polluted Mire

(T: Add B.)

Search your library for a card, put that card into your graveyard, then shuffle.

(T: Add B.)

At the beginning of each upkeep, create a 1/1 green Saproling creature token.

Return target creature card from your graveyard to the battlefield. Flashback—Sacrifice three creatures. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Flying Whenever Crosis deals combat damage to a player, you may pay 2B. If you do, choose a color, then that player reveals their hand and discards all cards of that color.

Trample Islandwalk (This creature can't be blocked as long as defending player controls an Island.) Shroud (This creature can't be the target of spells or abilities.)

Enchant creature card in a graveyard When this Aura enters, if it's on the battlefield, it loses "enchant creature card in a graveyard" and gains "enchant creature put onto the battlefield with this Aura." Return enchanted creature card to the battlefield under your control and attach this Aura to it. When this Aura leaves the battlefield, that creature's controller sacrifices it. Enchanted creature gets -1/-0.