Oubliette (Dark Mana Cost) [Arabian Nights] Gideon Takeno's Daisho is put into

Takeno's Daisho is put into a graveyard from the battlefield

Sword of War and Peace deals damage to that player equal to the number of cards in their hand and you gain 1 life for each card in your hand

or triggered ability

You create a token that's a copy of that creature

and Dominaria itself to the point of annihilation

Oubliette (Dark Mana Cost) [Arabian Nights] Gideon Takeno's Daisho is put intoSet: Arabian Nights Type: Enchantment Rarity: Common Cost: {1}{B}{B} When Oubliette enters the battlefield, target creature phases out until Oubliette leaves the battlefield. Tap that creature as it phases in this way. (Auras and Equipment phase out with it. While permanents are phased out, they're treated as though they don't exist.)