
Equipped creature has haste. (It can attack and {T} no matter when it came under your control.)
At the beginning of your upkeep, put a +1/+1 counter on equipped creature if it's red.
Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)
Ring of Valkas has 2 printings, first in Magic 2013 (2012). EDHREC ranks it #5,238 among Commander cards. It appears most in Obeka, Splitter of Seconds decks (12,872 on EDHREC). 1 public deck on TCG runs it.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.