Go-Shintai of Lost Wisdom is a uncommon Legendary Enchantment Creature — Shrine card from Kamigawa: Neon Dynasty (NEO), collector number 55. Current market price: $0.23 (foil $0.40), TCGplayer market prices via Scryfall.
Flying At the beginning of your end step, you may pay {1}. When you do, target player mills X cards, where X is the number of Shrines you control. (To mill a card, a player puts the top card of their library into their graveyard.)