Knowledge Exploitation [Morningtide] Commander Flashback—Sacrifice a creature

Flashback—Sacrifice a creature

Set: Aether Revolt Prerelease Promos Type: Artifact Creature — Construct Rarity: Rare Cost: {X}{X} Walking Ballista enters the battlefield with X +1/+1 counters on it

{W}{U}{B}{R}{G}: Untap all attacking creatures

Heretical Healer

Knowledge Exploitation [Morningtide] Commander Flashback—Sacrifice a creatureSet: Morningtide Type: Tribal Sorcery Rogue Rarity: Rare Cost: {5}{U}{U} Prowl {3}{U} (You may cast this for its prowl cost if you dealt combat damage to a player this turn with a Rogue.) Search target opponent's library for an instant or sorcery card. You may cast that card without paying its mana cost. Then that player shuffles.