Underworld Breach [Theros Beyond Death Prerelease Promos] Battle Royale Box Set you may pay {0} rather

you may pay {0} rather than pay the mana cost for a spell you cast with converted mana cost X or less

it produces colorless mana instead of white mana

If you do and they guessed wrong

Set: Mirage Type: Artifact Rare Cost: {0} Discard your hand

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Underworld Breach [Theros Beyond Death Prerelease Promos] Battle Royale Box Set you may pay {0} ratherSet: Theros Beyond Death Prerelease Promos Type: Enchantment Rarity: Rare Cost: {1}{R} Each nonland card in your graveyard has escape. The escape cost is equal to the card's mana cost plus exile three other cards from your graveyard. (You may cast cards from your graveyard for their escape cost.) At the beginning of the end step, sacrifice Underworld Breach.