Corrosive Mentor [Shadowmoor] Kaladesh Set: Alpha Edition Type: Enchantment

Set: Alpha Edition Type: Enchantment Rarity: Rare Cost: {R}{R} At the beginning of each player's upkeep

Set: Arabian Nights Type: Sorcery Rarity: Common Cost: {G} As an additional cost to cast this spell

Set: Mercadian Masques Type: Instant Rarity: Common Cost: {3}{B} If you control a Swamp

Part prison

that player adds one mana of any type that land produced

Corrosive Mentor [Shadowmoor] Kaladesh Set: Alpha Edition Type: EnchantmentSet: Shadowmoor Type: Creature Elemental Rogue Rarity: Uncommon Cost: {2}{B} Black creatures you control have wither. (They deal damage to creatures in the form of 1 1 counters.) Guttering cinders stoke their dying flames by snuffing out the lights of others.