Oust

In Commander, Oust competes in a crowded field of one-mana interaction and mostly loses — Path to Exile and Swords to Plowshares answer the same threat permanently. Where Oust earns a slot is in voltron or combat-centric decks that care less about permanent removal and more about surviving the turn, or in political builds where sending a threat to the bottom of a library (not exiling it) keeps you off the threat axis. In Legacy, it sees fringe play as a cheap answer that dodges graveyard-matters synergies — not putting a card in the bin matters there in ways it rarely does in Commander. Modern has mostly passed it by; one-mana removal in that format needs to answer anything cleanly, and the delayed return makes Oust too conditional. Oust is legal in Oathbreaker, where the low curve matters more and the one-mana cost is at its most relevant.