Sentinel is a MARVEL SNAP card that costs 2 energy and has 3 power. It has the effect: "On Reveal: Add another Sentinel to your hand."
It has variants that are part of the Pixel, Steampunk, Blueprints, Jim Lee and Kael Ngu categories.
Sentinel has synergy with Iron Man, Mystique, Cerebro, Bast and Valkyrie.