See Red

The end-step clause is the whole bargain: you get a genuinely aggressive stat boost and first strike for two mana, but the Aura only sticks around if you actually swung that turn. That sacrifice condition is doing the work that a higher mana cost or a worse buff would do elsewhere. It prices the card for committed attackers and quietly taxes anyone who wants to use it as a defensive trick or a tempo play that stays home. The buff itself is built for combat math rather than raw size: +2/+1 with first strike turns a small creature into something that trades up and survives the swing, letting a one-drop punch through a larger blocker and live. The downside is the Aura tax built into every Aura, that a removal spell answers two cards at once, but here the conditional sacrifice adds a second pressure: a board stall or a turn spent on defense can dissolve your investment on its own. It is an aggressive-deck enabler in the older lineage of attack-or-lose enchantments, where the reward for aggression is folded into the card's own survival rather than handed to you for free.