Kyoshi Warriors
The Ally subtype cares about arrivals, not sizes: dozens of white and blue Allies through the game's history trigger off how many members have entered rather than how big any one of them is. That mechanical fact is what gives this 3/3 its reason to exist. A single cast puts two Allies on the board, doubling the arrival count off one card, which is worth roughly double to any engine that fires per-enter. The token being a generic white Ally rather than another Warrior is the tell about the card's job: it feeds the count and holds a line, not a specific Warrior payoff. Structurally it descends from white's two-for-one bodies that spread value across independent permanents (Cloudgoat Ranger and the various small-token hatchers are the obvious ancestors), where the appeal is board presence you can block, pump, or sacrifice piecemeal rather than a single large threat. Nothing about the rate is pushed; four mana for a 3/3 and a 1/1 is fair rather than exciting. The identity is narrower and quieter than the stat line implies: it exists to make the Ally counter tick twice off one card, in a subtype where showing up in numbers is the whole point.
