Enchantment
Soulcatchers' Aerie
Whenever a Bird is put into your graveyard from the battlefield, put a feather counter on this enchantment. Bird creatures get +1/+1 for each feather counter on this enchantment.
From Magic: The Gathering.
Exact printings
Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6ohu5zcu11pb1hsgwv0hbh.