Yoshimaru, Beloved Companion is a uncommon Legendary Creature — Dog card from Reality Fracture (FRA), collector number 209. Current market price: $0.25 (foil $0.37), TCGplayer market prices via Scryfall.
If one or more +1/+1 counters would be put on a creature you control, that many plus one +1/+1 counters are put on it instead. {6}: Put a +1/+1 counter on target legendary creature.