Lightning, Army of One

First strike, trample, and lifelink on a three-mana body already read like an aggressive curve-topper's spec sheet, but the keyword bundle is scaffolding for the real mechanic. Stagger doesn't sweeten her own swing; it hangs a debuff on whichever player she connects with, and until your next turn every source that would damage that player or their permanents deals double. That single distinction reframes the whole card: she stops being a beater and starts being an enabler, because the doubling never touches her attack, only what you fire off afterward. Land a hit and a follow-up burn spell counts double, a second attacker counts double, a sweeper that pings counts double. The first-strike-and-lifelink pairing is what makes the setup trustworthy: she wins most small skirmishes clean and refills your life while doing it, so the turn spent forcing the connection isn't a wasted tempo turn. The gate is that the trigger keys off damage to the player, not a creature, so she has to break through or slip past a board before the engine comes online at all. That restriction is what keeps a doubling effect at three mana from being oppressive: no swing, no debuff, and defenders answer her cleanly. Built right, she's a two-step play. Connect once, then dump everything you have into a target that suddenly takes twice of it.