Super-Adaptoid

The Adaptoid's flavor was always mechanical mimicry: a construct that copies whatever it faces. This is the cleanest keyword-theft engine the concept has produced, and the design trick is that it never touches the card it points at. It reads eleven evergreen keywords off a single target and, in one resolution, stamps every applicable one onto itself with a counter, so nothing is stolen or diminished; the mimicry is additive, one-directional, and permanent. Point it at a creature that has haste, flying, and trample and it walks away with all three counters at once, not one per turn. Two mana buys a body with no fixed size (its power scales with your legendary count, which the two-mana price bakes in as a legend-matters payoff) and a profile that ratchets meaner every time it swings. Because the trigger fires on both entry and attack, and it can point at your own creatures, the intended build is not adversarial at all: aim it at whatever keyword-loaded threats you already own and let it absorb their loadouts over successive attacks against different targets. The subtlety is in the "and Super-Adaptoid doesn't" clause on every keyword: once it owns a keyword, that slot is closed, so each trigger is spent chasing something genuinely new rather than duplicating what it has. It is a snowball wearing a villain's face, and the ceiling is bounded only by how many distinct keywords your board can show it.