Tahm, The River King

Whenever Tahm attacks or enters the battlefield, exile target creature. When Tahm leaves the battlefield, return all creatures exiled with Tahm to the battlefield under their owners' control. As long as one or more creatures are exiled with Tahm: If there is one card exiled, create a Food token and a Treasure token at the beginning of your upkeep. If there are two cards, Tahm has swampwalk and islandwalk. If there are three or more cards, you may spend mana as though it were mana of any color to cast crea