Umezawa's Charm
The tribute-charm template, given a black entry. The two-mana modal instant that grew out of the older five-charm cycle has always traded raw power for the guarantee that no mode is ever fully dead: a pump, a shrink, and a life buffer, priced so that whichever line the board demands is a snap decision. This one takes black's version of that split. The +2/+2 is a combat trick when you're pressing an attack; the -1/-1 is spot removal against the small creatures black most wants to punish (mana dorks, tokens, one-toughness utility bodies) and doubles as a way to tip a losing block; the two life is the release valve when the first two modes are irrelevant, keeping the card from ever rotting in hand. What holds the design in check is that no single mode is a bargain in isolation: a real removal spell kills more, a real trick swings for more, and two life buys almost nothing. The card sells flexibility instead, and the cost of that flexibility is that you rarely get the best version of any one effect. The naming carries a nod to the Umezawa lineage from Kamigawa's storyline, but the mechanical DNA is the charm framework: three narrow answers folded into one card that asks you to read the board before you cast rather than after.
