@Chagren I feel like being able to swap you worst creature with their best creature every turn, at instant speed, for only 2 mana, while also dealing damage, doesn't sound like a very good time for anyone else at the table. Imagine you've got a token generator that makes little 1/1's with no abilities every turn. You can swap it, and then kill the creature you gave them with the ability, making the card read, "get the best creature on the board each turn with no downside". Building around stealing other people's cards is notoriously salt inducing, and making it repeatable, cheap, and adding burn on top of that is really intense. I'd, at the very least, raise the cost of the tap ability, but I'd also recommend making the damage only going to players (or specifically the card's owner), making the exchange until the Djinn leaves the battlefield rather than permanent, getting rid of haste so players can react before you use the ability, requiring you to exchange non-token creatures, etc.
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I'd, at the very least, raise the cost of the tap ability, but I'd also recommend making the damage only going to players (or specifically the card's owner), making the exchange until the Djinn leaves the battlefield rather than permanent, getting rid of haste so players can react before you use the ability, requiring you to exchange non-token creatures, etc.