Ancient Gear Castle [SD10-EN023] Common

Each face-up "Ancient Gear" monster gains 300 ATK. Each time a monster(s) is Normal Summoned or Set, put 1 counter on this card. If you Tribute Summon an "Ancient Gear" monster, you can substitute this card for a Tribute(s), if the number of counters is equal to or greater than the number of required Tribute(s).