Rip, Spawn Hunter

Survival is the mechanic that finally hands green-white a payoff keyed to a stat that used to be pure combat math: whether a creature is sitting untapped or committed. The trigger fires at the beginning of your second main phase if this is tapped, and the how of getting tapped is where the design breathes. Swinging in is the obvious route, but crewing a Vehicle taps it just as well, so the card can dig without ever exposing itself in combat: it can search for the very Vehicles that then tap it next turn. The reveal count scales with power, so a boosted body sees deeper, and the "different powers" clause is the clever governor: you cannot rake in a fistful of identical two-drops, which pushes the deck toward a toolbox of differently-sized creatures and Vehicles rather than redundant copies. That variety requirement also caps the raw velocity, so a single big swing does not dump the top of your library into your hand. Green-white midrange has always had bodies and rarely a clean way to refuel after committing to the board; this ties the refill to being tapped, and being tapped is a choice you can make on offense or by crewing. The payoff and the risk share one decision, but the decision is broader than "attack or hold back," and that flexibility is what keeps a modest-looking 4/4 relevant across a whole game.