Mox strategy
Ulamog's Reclaimer is a solid value creature for grindy decks, especially in Commander and slower Eternal formats. Its main strength is converting exile resources into recursion: if an opponent has cards in exile, it can return an instant or sorcery from your graveyard, giving you card advantage on a 2/5 body.
Best use cases are decks that naturally interact with exile, or that can reliably enable the trigger through processors, blink, or self-mill. It pairs well with cards that exile opposing cards, effects that repeatedly blink it, and spells-heavy decks that want to rebuy removal, counters, or tutor effects.
Key mechanics it supports are exile-to-graveyard conversion, graveyard recursion, and ETB value. It’s strongest when your deck can consistently turn on the trigger; otherwise it’s still an acceptable defensive blocker, but much weaker as pure value.
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