Corrosive Mentor [Shadowmoor] RC19 put a -1 [Defense] counter

put a -1 [Defense] counter on it when the combat chain closes then destroy it if it has 0 [Defense]

Set: Promo Finish: Regular Type: Action Subtype: Attack Rarity: Promo Class: Brute Cost: 2 Power: 8 As an additional cost to play Wrecker Romp

Psychic Rarity: Ultra Rare Retreat cost: Colorless

Creatures you control are the chosen type in addition to their other types

Set: Iconic Masters Type: Instant Rarity: Rare Cost: {1}{U}{U}{U} Choose two —

Corrosive Mentor [Shadowmoor] RC19 put a -1 [Defense] counterSet: 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.