Bloodline Pretender is a uncommon Artifact Creature — Shapeshifter card from March of the Machine Commander (MOC), collector number 350. Current market price: $2.37, TCGplayer market prices via Scryfall.
Changeling (This card is every creature type.) As this creature enters, choose a creature type. Whenever another creature you control of the chosen type enters, put a +1/+1 counter on this creature.