Rite of the Raging Storm is a uncommon Enchantment card from Commander 2015 (C15), collector number 30. Current market price: $1.67, TCGplayer market prices via Scryfall.
Creatures named Lightning Rager can't attack you or planeswalkers you control. At the beginning of each player's upkeep, that player creates a 5/1 red Elemental creature token named Lightning Rager. It has trample, haste, and "At the beginning of the end step, sacrifice this token."