Ulamog, the Infinite Gyre [Modern Masters 2015] Mythic The purpose of any moat

The purpose of any moat is to impede attack

Search your library for an artifact card and put that card onto the battlefield

return target spell or permanent to its owner's hand

Set: Unlimited Edition Type: Land — Swamp Mountain Rare Cost: ({T}: Add {B} or {R}

you might as well trade it for something else

Ulamog, the Infinite Gyre [Modern Masters 2015] Mythic The purpose of any moatSet: Modern Masters 2015 Type: Legendary Creature Eldrazi Mythic Cost: {11} When you cast this spell, destroy target permanent. Indestructible Annihilator 4 (Whenever this creature attacks, defending player sacrifices four permanents.) When Ulamog, the Infinite Gyre is put into a graveyard from anywhere, its owner shuffles their graveyard into their library.