Wolfrider's Saddle is a uncommon Artifact — Equipment card from Core Set 2020 (M20), collector number 204. Current market price: $0.20 (foil $0.35), TCGplayer market prices via Scryfall.
When this Equipment enters, create a 2/2 green Wolf creature token, then attach this Equipment to it. Equipped creature gets +1/+1 and can't be blocked by more than one creature. Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)