
Creatures you control get +1/+1 and gain lifelink until end of turn. Untap those creatures. (Damage dealt by those creatures also causes you to gain that much life.)
Tenacity has 3 printings, first in Shadows over Innistrad (2016). EDHREC ranks it #19,235 among Commander cards. It appears most in Thurid, Mare of Destiny decks (248 on EDHREC). It has 2 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.