Increase the ATK of each face-up monster on the field that includes "Ancient Gear" in its card name by 300 points. Each time a monster(s) is Normal Summoned or Set, put 1 counter on this card. If you Tribute Summon a monster that includes "Ancient Gear" in its card name, 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)..