Esper Sentinel is a rare Artifact Creature — Human Soldier card from Modern Horizons 2 Timeshifts (H2R), collector number 2. Current market price: $59.34 (foil $89.11), TCGplayer market prices via Scryfall.
Whenever an opponent casts their first noncreature spell each turn, draw a card unless that player pays {X}, where X is this creature's power.