T-45 Power Armor is a rare Artifact — Equipment card from Secret Lair Drop (SLD), collector number 2452. Current market price: $0.82 (foil $0.90), TCGplayer market prices via Scryfall.
When this Equipment enters, you get {E}{E} (two energy counters). Equipped creature gets +3/+3 and doesn't untap during its controller's untap step. At the beginning of your upkeep, you may pay {E}. If you do, untap equipped creature, then put your choice of a menace, trample, or lifelink counter on it. Equip {3}