Phyrexian Altar (Borderless Alternate Art) [Double Masters 2022] Amonkhet Prerelease Promos Whenever Infernal Medusa becomes blocked

Whenever Infernal Medusa becomes blocked by a non-Wall creature

At the beginning of each end step or when Tombstone Stairwell leaves the battlefield

Then that player loses all unspent mana and you add the mana lost this way

Set: Coldsnap Type: Instant Rarity: Rare Cost: {5}{U}{U} You may exile two blue cards from your hand rather than pay this spell's mana cost

Set: Secret Lair Drop Series Type: Creature — Rat Rarity: Rare Cost: {1}{B} Rat Colony gets +1/+0 for each other Rat you control

Phyrexian Altar (Borderless Alternate Art) [Double Masters 2022] Amonkhet Prerelease Promos Whenever Infernal Medusa becomes blockedSet: Double Masters 2022 Type: Artifact Rarity: Rare Cost: {3} Sacrifice a creature: Add one mana of any color. Offerings must first be freed from the prison of their own skin before they're welcomed into the Flesh Singularity.