Blinding Flare

The Falter effect, scaled. The single-target Falter has always been an aggro finisher: spend one red mana, strip a key blocker, push the lethal swing through. Strive turns that one-shot trick into a variable-width tool, charging an extra red for each defender you want to neutralize, so the same card that clears one wall on a tight turn can sweep an entire blocking line when you have the mana to spare. The cost structure is the honest part of the deal: every additional creature you name taxes the same color the rest of your aggressive hand wants, which means the wide version is rarely free and usually arrives on a turn where you are already overcommitted to the red side of your curve. It does nothing to the creatures themselves (they survive, untapped, ready to attack you back), so this is purely a tempo lever, valuable only on the turn you intend to close. That narrowness is the whole point of the effect's lineage: cards in this family live or die on whether the deck is built to convert one unblocked alpha strike into a dead opponent. Strive just lets that conversion plan flex to the size of the board in front of you.