Arcbound Mouser is a common Artifact Creature — Cat card from The List (PLST), collector number MH2-3. Current market price: $0.30, TCGplayer market prices via Scryfall.
Lifelink Modular 1 (This creature enters with a +1/+1 counter on it. When it dies, you may put its +1/+1 counters on target artifact creature.)