First printed in Shadowmoor (2008)
Corrosive Mentor 
Creature — Elemental Rogue
Black creatures you control have wither. (They deal damage to creatures in the form of -1/-1 counters.)
Legality
- Legal in
- Modern, Legacy, Vintage, Commander, Duel Commander, PreDH, Tiny Leaders, Oathbreaker
- Not legal in
- Standard, Pioneer, Pauper, Future Standard, Historic, Timeless, Alchemy, Penny Dreadful, Premodern, Old School 93/94, Gladiator, Pauper Commander, Brawl, Standard Brawl, Competitive Brawl
MTGO price: 0.02 TIX, the cheapest non-foil print (average sell price on GoatBots, 28 Oct 2026).
