Shriekdiver

The self-hasting activation is the one design choice worth pausing on. A 2/1 flier with a fragile body would ordinarily wait a turn to attack, ceding a window of damage that an aggressive deck can least afford; paying a single mana to gain haste closes that gap the turn it lands. The activation is deliberately narrow: haste only matters on the turn the creature enters, so this is not a mana sink for the late game but a cast-and-swing enabler, turning a fresh recruit into immediate evasive reach when the ground has stalled and you need to sneak in over the top. Everything else is by the numbers: a body that trades down to almost anything, flying that everyone recognizes, and a tribal stack (Zombie Bird Warrior) that reads as checklist coincidence rather than a payoff hook. This is a curve-filler, not a build-around: a self-contained evasive threat for an aggressive black shell that wants to press tempo without spending a card or a turn to set it up. Its ambition begins and ends with hitting one turn early, and it executes that cleanly enough that the single point of black-aligned reach is all it was ever meant to buy.