Slingbow Trap

Strip away the conditional pricing and what sits underneath is a four-mana destroy-target-attacking-flier spell, a rate green has almost never wanted to pay full freight for. The alternative cost is the only thing that justifies the card existing, and it unlocks against one narrow situation: a black flier already attacking. That makes Slingbow Trap a wager on a specific opponent rather than a tool you can lean on, because the condition lives entirely on the other side of the table. The opponent has to commit a black evasive threat to combat before the green mana ever does anything cheap. The framing as a reactive trick is real, but the effect is gated so tightly that the bargain arrives only after the board has already told you exactly what to kill. There is a color-pie logic to the narrowness: green's relationship with flying is built to be adversarial, swatting fliers it cannot chase, and this is that grudge encoded as a contingency. You collect the reward only against the precise kind of creature green was designed to resent, and only when that creature is already in the air. Meet none of those conditions and you are holding overpriced situational removal; meet all of them and a single green mana undoes the attack. The card lives or dies on a board state it does not control.