Seascape Aerialist

Evasion is the rarest thing a wide tribal board can buy, and this Merfolk Wizard sells it on a chained trigger: every Ally that arrives, including itself, can lift the whole team off the ground for a single attack. That turns a horde of grounded bodies into something that flies over a stalled ground war, which is precisely the spot where go-wide tribal decks otherwise get stuck. The buff expires at the end of the turn, so the card rewards dumping your hand into play the turn you mean to swing rather than holding flyers back to block. At its printed cost the 2/3 body is barely a footnote; the rate is paying for the trigger, and the trigger is only worth what the surrounding Ally count makes it. In a deck thin on tribal creatures it does almost nothing, which is the honest edge of the design: it pays off an investment you must already have made. The evasion is real but not total (reach and opposing flyers still wall a swarm), so where the Allies come fast and the enters-the-battlefield triggers stack up, what matters is timing, not redundancy: one well-placed trigger before combat sends an entire board over the top of a defense built to hold the dirt.