Myr Custodian is a common Artifact Creature — Myr card from Phyrexia: All Will Be One (ONE), collector number 235. Current market price: $0.27 (foil $0.28), TCGplayer market prices via Scryfall.
When this creature enters, scry 2. Then each opponent may scry 1. (To scry X, a player looks at the top X cards of their library, then puts any number of them on the bottom and the rest on top in any order.)