Sentinel's Eyes is a common Enchantment — Aura card from Theros Beyond Death (THB), collector number 36. Current market price: $0.30 (foil $0.45), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature gets +1/+1 and has vigilance. Escape—{W}, Exile two other cards from your graveyard. (You may cast this card from your graveyard for its escape cost.)