Sneaky "C" is a Ultra Rare Effect Monster card from Yu-Gi-Oh! (25th Anniversary Tin: Dueling Mirrors, MP24). Current market price: $0.33.
Ultra Rare
25th Anniversary Tin: Dueling Mirrors (MP24)
Card Text
When your opponent Special Summons a monster(s) (except during the Damage Step): You can Special Summon this card from your hand in face-down Defense Position, and if you do, during the End Phase of this turn, change it to face-up Defense Position. You can only use this effect of "Sneaky "C"" once per turn. If this card is flipped face-up during the End Phase: Destroy all Special Summoned monsters on the field.
