Siren Reaver

Raid was built to reward decks that commit to the attack, and this is one of its cleanest expressions on a tempo body: a 3/2 flier that wants to enter after the swing has already happened, arriving at three mana once you have pressured the board. The structural trick is that the discount lives in the casting cost itself, not on an enters-the-battlefield trigger, so the whole question is sequencing. Attack first, then deploy a flier at a discount; or pay the full four mana if you would rather keep a creature back on defense. Raid asks you to declare your turn's intent before you know whether the discount will pay off, and that ordering constraint is what keeps an evasive three-power creature from being free. The 3/2 body is fragile enough that almost any removal or blocker trades up, so the card reads most honestly as a clock that arrives ahead of curve in an aggressive shell rather than a midrange value piece. The evasion is only worth a discount because the discount is conditional on a play pattern the deck was already going to execute: in a board built to swing every turn, the Raid clause quietly converts a fine four-drop into an efficient three-drop without changing a single line you wanted to make anyway.