Moonglove Changeling

What separates this Shapeshifter from most of its cohort is that it carries its own payoff rather than borrowing one. The bulk of these bodies earned their slots by feeding a tribal lord or ticking a creature-type clause; this one comes with a self-contained activated ability that matters whether the deck cares about types or not. Spend a black mana and the 2/2 trades up against any single creature it meets in combat: on offense it punishes a profitable block, on defense it walls off whatever it faces. The activation cost is what shapes how it plays, because the timing is yours to pick. The grant is instant-speed and lasts until end of turn, so on defense you wait until the declare blockers step, after blocks are committed and before combat damage is dealt, to spend the mana on exactly the creature you blocked. On offense you can hold the black up as a bluff and decide after your opponent declares blockers whether the deathtouch is worth the cost. Because the body still blocks only one attacker, it taxes the opponent's most valuable creature rather than policing a wide swing: deathtouch makes whatever it points at unprofitable to send in, but one body cannot deter a full board alone. The changeling line means the generically useful ability and the tribal shell never fight over it, so it reads in two registers without either taxing the other: a flexible deathtouch blocker for a fair midrange build, a free tribal member for an aggressive one.