Undercity Upheaval
The undergrowth mechanic asks you to fill a graveyard with creatures and then cash it in, and this is the payoff card that scales harder than any single-target pump ever could. The count isn't fixed at a body: X is your graveyard's dead creatures spread across as many of your board as you like, so a wide, well-fed team all grows at once rather than one attacker ballooning into a removal magnet. That distribution clause is the whole strategic axis. A go-wide aristocrats or self-mill deck that has been trading creatures away all game turns its losses into a coordinated size boost, and the +1/+1 counters stick around after the turn ends, unlike a temporary pump. The vigilance rider is what closes the loop on the tempo problem such a spell usually creates: at three mana on your main phase you'd normally choose between developing and attacking, but here the counters land and your creatures can swing without dropping their guard, so the alpha strike doesn't leave you open on the crackback. It rewards the deck that treats its graveyard as a resource pool rather than a loss column, which is exactly the corner of green that self-sacrifice and mill decks live in.
