Sanctum of All is a rare Legendary Enchantment — Shrine card from Core Set 2021 (M21), collector number 381. Current market price: $7.59 (foil $11.44), TCGplayer market prices via Scryfall.
At the beginning of your upkeep, you may search your library and/or graveyard for a Shrine card and put it onto the battlefield. If you search your library this way, shuffle. If a triggered ability of another Shrine you control triggers while you control six or more Shrines, that ability triggers an additional time.