Underground Sentinel Base Tweet Out of stock. Wishlist Details Card Number: MOR-155 Card Text: 1 Activate Reveal a face-down army Sentinel character card in your resource row and move it face up to your front row or support row. Use this power only during your recruit step. Card Type: Location Cost: 5 Flavor Text: Death from below. Illustrator: Matt Smith Legality: Golden Age Rarity: Rare Set: Marvel: Origins