Sword of Dungeons & Dragons is a mythic Artifact — Equipment card from Unsanctioned (UND), collector number 84. Current market price: $0.83, TCGplayer market prices via Scryfall.
Equipped creature gets +2/+2 and has protection from Rogues and from Clerics. Whenever equipped creature deals combat damage to a player, create a 4/4 gold Dragon creature token with flying and roll a d20 (a twenty-sided die). If you roll a 20, repeat this process. Equip {2}