Maha, Its Feathers Night
The static ability is the whole engine, and it works by rewriting a number every other card on the battlefield quietly depends on. Setting every opposing creature's base toughness to 1 does not deal damage; it just moves the finish line. Suddenly any point of damage kills anything, so a lone one-drop pinger sweeps the board, a single toughness-reducer becomes a mass removal spell, and combat math collapses in the controller's favor. It stacks under, not over, other effects: an opponent's Giant Growth still adds to a base of 1, and only other static abilities that also set base toughness fight it directly. What makes this dangerous rather than fragile is that the effect lives on a 6/5 flyer with trample, so the body that enables the kill can also close the game on its own. The Ward cost is discarding a card, a tax that hits control mirrors and interaction-heavy decks harder than aggro, since it asks the removal-holder to spend two resources to answer one. Toughness-as-target is old design space (Elesh Norn, Grand Cenobite works the same lever from the other direction, and minus-toughness anthems have chipped at it for years), but folding the reduction onto a single evasive threat is what turns a support piece into a haymaker. The card asks nothing of your board and everything of theirs.
