Emergent Ultimatum

Search your library for up to three monocolored cards with different names and exile them. An opponent chooses one of those cards. Shuffle that card into your library. You may cast the other cards without paying their mana costs. Exile Emergent Ultimatum.

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Ikoria: Lair of Behemoths

A monocolored card is exactly one of white, blue, black, red, or green and no other colors. A colorless card isn’t monocolored.

Emergent Ultimatum is still on the stack while you cast the cards you found, so those spells could target it. However, once it’s exiled, it will no longer be a legal target.

If a spell has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.

If you cast a spell “without paying its mana cost,” you can’t choose to cast it for any alternative costs. You can, however, pay additional costs, such as kicker costs. If the card has any mandatory additional costs, such as that of Cathartic Reunion, those must be paid to cast the card.

If you find only one card, you’ll shuffle it into your library and exile Emergent Ultimatum without casting anything.

If you wish to cast any exiled cards, you do so as part of the resolution of Emergent Ultimatum. You can’t wait to cast them later. Timing permissions based on a card’s type are ignored.