Corrosive Mentor [Shadowmoor] Lightning[-30] Fighting[-30] If you control this card

If you control this card that was Xyz Summoned this turn by using an "Exosister" monster as material (Quick Effect): You can target 1 card your opponent controls or in their GY

This card can only be Special Summoned

) (Quick Effect): You can detach 2 materials from this card

Set: Miscellaneous Cards Type: Lightning Rarity: Promo Retreat cost: Colorless

Corrosive Mentor [Shadowmoor] Lightning[-30] Fighting[-30] If you control this cardSet: 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.