Ramosian Greatsword is a uncommon Artifact — Equipment card from March of the Machine (MOM), collector number 159. Current market price: $0.23 (foil $0.27), TCGplayer market prices via Scryfall.
Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.) Equipped creature gets +3/+1 and has trample. Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)