Bilbo's Ring
Legendary Artifact — Equipment
During your turn, equipped creature has hexproof and can't be blocked.
Whenever equipped creature attacks alone, you draw a card and you lose 1 life.
Equip Halfling 
(: Attach to target Halfling you control. Equip only as a sorcery.)
Equip 
(: Attach to target creature you control. Equip only as a sorcery.)
Randy Gallegos
Rulings
A creature attacks alone if it's the only creature declared as an attacker during the declare attackers step. For example, Bilbo's Ring's second ability won't trigger if you attack with multiple creatures and all but one of them are removed from combat.
(wotc • 2023-06-16)
Rulings
A creature attacks alone if it's the only creature declared as an attacker during the declare attackers step. For example, Bilbo's Ring's second ability won't trigger if you attack with multiple creatures and all but one of them are removed from combat.
(wotc • 2023-06-16)