Eater of Millions (BLRR-EN078) [Battles of Legend: Relentless Revenge]

Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by banishing 5 or more cards from your hand, field and/or Extra Deck, face-down, and cannot be Special Summoned by other ways. This card gains 100 ATK and DEF for each face-down banished card. This face-up card on the field cannot be Tributed, nor used as Material for a Fusion, Synchro, or Xyz Summon. Once per turn, at the start of the Damage Step, if this card battles an opponent's monster: You can banish that opponent's monster, face-down.