Super Anti-Kaiju War Machine Mecha-Dogoran (OP04-EN021) [OTS Tournament Pack 4]

Cannot be Normal Summoned/Set. Must first be Special Summoned (from your hand) while your opponent controls a "Kaiju" monster. You can only control 1 "Kaiju" monster. Once per turn: You can remove 2 Kaiju Counters from anywhere on the field; equip 1 "Kaiju" monster from your hand or Graveyard to this card. This card gains ATK equal to the combined original ATK of the "Kaiju" monsters equipped to it by this effect.