Karn, Scion of Urza [Dominaria Prerelease Promos] Black You may reveal an Aura

You may reveal an Aura

it produces colorless mana instead of white mana

Set: Arabian Nights Type: Creature — Zombie Rarity: Uncommon Cost: {2}{B} At the beginning of each end step

{T}: Create a 1/1 white Vampire creature token with lifelink

Set: Beta Edition Type: Artifact Rarity: Rare Cost: {3} {1}: The next time an unblocked creature of your choice would deal combat damage to you this turn

Karn, Scion of Urza [Dominaria Prerelease Promos] Black You may reveal an AuraSet: Dominaria Prerelease Promos Type: Legendary Planeswalker Karn Rarity: Mythic Cost: {4} +1: Reveal the top two cards of your library. An opponent chooses one of them. Put that card into your hand and exile the other with a silver counter on it. 1: Put a card you own with a silver counter on it from exile into your hand. 2: Create a 0 0 colorless Construct artifact creature token with "This creature gets +1 +1 for each artifact you control."