Mendicant Core, Guidelight is a rare Legendary Artifact Creature — Robot card from Aetherdrift Promos (PDFT), collector number 213p. Current market price: $0.66 (foil $1.21), TCGplayer market prices via Scryfall.
Mendicant Core's power is equal to the number of artifacts you control. Start your engines! (If you have no speed, it starts at 1. It increases once on each of your turns when an opponent loses life. Max speed is 4.) Max speed — Whenever you cast an artifact spell, you may pay {1}. If you do, copy it. (The copy becomes a token.)