Kari Zev's Expertise [Aether Revolt Prerelease Promos] Eternal Masters it has vigilance and "{T}:

it has vigilance and "{T}: Add one mana of any color

"Let go of your memories and be reborn

As Skyshroud War Beast enters the battlefield

Set: Conflux Promos Type: Legendary Creature — Demon Dragon Rarity: Rare Cost: {2}{B}{B}{R}{R} Flying

that player discards a card and you untap all lands you control

Kari Zev's Expertise [Aether Revolt Prerelease Promos] Eternal Masters it has vigilance and "{T}:Set: Aether Revolt Prerelease Promos Type: Sorcery Rarity: Rare Cost: {1}{R}{R} Gain control of target creature or Vehicle until end of turn. Untap it. It gains haste until end of turn. You may cast a spell with mana value 2 or less from your hand without paying its mana cost. "I was made for this!"