Standardize

Tribal mechanics only work because creature types are stable: a lord buffs Goblins, a board wipe names Elves, an ability cares what type is blocking it. This instant attacks that stability at the root by collapsing every creature into a single type of your choosing, and the disruptive uses are the point. A spell that destroys all of one type now answers the whole board (a symmetrical sweep, since it hits your creatures too); an opponent's lords stop finding anything to lord over once every type reads the same; a tribal removal clause or a block-dependent trigger suddenly touches creatures it never could before. The Wall exclusion is the design tell, and it has a precise reason: in the era this kind of card was printed, the Wall type carried the intrinsic rule that Walls cannot attack, so naming Wall would have turned a two-mana instant into a combat lock, freezing every attacker on the board. Carving it out keeps the spell pointed outward rather than weaponized as a one-turn Fog. Instant speed is what elevates it past gimmick: it slots into the window after blocks are declared, rewriting which creatures a pump effect or a tribal clause can legally reach once both players have committed. The catch is its dependence. The effect only earns its slot when creature types are doing heavy lifting elsewhere on the board, which keeps it a sharp answer to tribe-heavy fields rather than anything you reach for blind.