Nahiri's Stoneblades

The pump spell that splits its buff across two attackers rather than dumping it all onto one, and that split is exactly what the design is for. A single-target +4/+0 makes one creature a threat but leaves the defender one block away from neutralizing your alpha strike; spreading +2/+0 across two bodies forces the opposing blocks to spread too, which is how a red aggressive board turns a stalled ground into lethal in one attack step. At instant speed it doubles as a combat blowout: cast it after blocks are declared and you can win two fights at once, or turn a chump into a trade the defender did not sign up for. The ceiling is a two-creature swing, but even the floor (a single creature getting +2/+0 for a decent trick) is serviceable, which is why the "up to two" wording matters more than it looks. It sits in the long line of go-wide red combat tricks that reward having a board already, not a card that generates advantage from nothing. The strict limitation is the +0 toughness: it never saves a creature from removal or an even trade on the swing back, so every point of value it offers is offensive, pushing damage through and nothing else.