Adaptive Automaton is a rare Artifact Creature — Construct card from The Brothers' War Retro Artifacts (BRR), collector number 1. Current market price: $1.24 (foil $2.50), TCGplayer market prices via Scryfall.
As this creature enters, choose a creature type. This creature is the chosen type in addition to its other types. Other creatures you control of the chosen type get +1/+1.