Kree Sentinel is a common Artifact Creature — Kree Robot Villain card from Marvel Super Heroes (MSH), collector number 141. Current market price: $0.10 (foil $0.19), TCGplayer market prices via Scryfall.
Reach Basic landcycling {2} ({2}, Discard this card: Search your library for a basic land card, reveal it, put it into your hand, then shuffle.)