From Under the Floorboards (Prerelease) [Shadows over Innistrad Prerelease Promos] OP01-026 Gabriel Angelfire gains that ability

Gabriel Angelfire gains that ability until your next upkeep

You may cast the other without paying its mana cost

Set: Unfinity Type: Creature — Azra Employee Rarity: Uncommon Cost: {2}{B} Menace

Rootwater merfolk are seldom seen these days

Set: Mystery Booster Type: Creature — Spirit Avatar Rarity: Rare Cost: {U/R}{U/R}{U/R}{U/R}{U/R} Flying

From Under the Floorboards (Prerelease) [Shadows over Innistrad Prerelease Promos] OP01-026 Gabriel Angelfire gains that abilitySet: Shadows over Innistrad Prerelease Promos Type: Sorcery Rarity: Rare Cost: {3}{B}{B} Madness {X}{B}{B} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.) Create three tapped 2 2 black Zombie creature tokens and you gain 3 life. If this spell's madness cost was paid, instead create X of those tokens and you gain X life.