Doubling Cube [Fifth Dawn] San Diego Comic-Con 2013 Set: Core Set 2019 Prerelease

Set: Core Set 2019 Prerelease Promos Type: Legendary Planeswalker — Sarkhan Rarity: Mythic Cost: {1}{R}{R} +1: You may discard a card

If it's a land card

where X is the number of times the letter of your choice appears in that creature's name

the Firemind deals 1 damage to any target

Set: Beta Edition Type: Enchantment — Aura Rarity: Uncommon Cost: {W} Enchant creature

Doubling Cube [Fifth Dawn] San Diego Comic-Con 2013 Set: Core Set 2019 PrereleaseSet: Fifth Dawn Type: Artifact Rare Cost: {2} {3}, {T}: Double the amount of each type of unspent mana you have. The cube's surface is pockmarked with jagged runes that seem to shift when unobserved.