Holy Knight Burial Grounds (AOA-007) [Awakening of the Ancients]

Whenever a resonator you control is put into a graveyard from the field -> Put a grave-post counter on this card. Resonators you control gain [+200/+200] as long as there are three or more grave-post counters on this card. As long as there are seven or more grave-post counters on this card, they gain [+400/+400] instead.