Blackwing Armor Master (Quarter Century Secret Rare) - 25th Anniversary Tin: Dueling Heroes (TN23)

1 "Blackwing" Tuner + 1 or more non-Tuner monsters
Cannot be destroyed by battle, and you take no battle damage from attacks involving this card. At the end of the Damage Step, if this card attacked a monster: You can place 1 Wedge Counter on that monster (max. 1). You can remove all Wedge Counters from your opponent's monsters; the ATK and DEF of those monsters that had Wedge Counters become 0 until the end of this turn.