Skeletal Changeling

A Shapeshifter that wears every tribe at once and then spends its mana clinging to the battlefield: that combination is more pointed than the dull 1/1 body suggests. The regeneration cost asks for the same black mana that printed the body, so the floor is a creature that survives combat and any targeted removal that allows regeneration, and the ceiling is whatever its all-types line lets it stand in for. As a member of an Elf deck, a Goblin deck, and a Soldier deck all simultaneously, it satisfies tribal lords and "choose a creature type" triggers without committing the deck to any single line. The tension is that those two halves rarely want the same game: the changeling clause begs for a wide go-tall tribal board where one body matters little, while regeneration wants a long grind where a recurring blocker is worth real mana. It resolves into a stubborn role-player, a creature you feed mana into to keep a tribe-count alive while bigger things resolve around it. The regeneration is the brake on the rest: it costs mana every time and does nothing against exile, sacrifice, or bounce, so the card stays durable without tipping into oppressive, a small black brick any tribe can borrow.