Ring of Evos Isle is a uncommon Artifact — Equipment card from Magic 2013 (M13), collector number 211. Current market price: $0.39 (foil $2.88), TCGplayer market prices via Scryfall.
{2}: Equipped creature gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.) At the beginning of your upkeep, put a +1/+1 counter on equipped creature if it's blue. Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)