Arcanist's Coil

{t}: Add {u} or {r}.
{u}, {t}: Draw a card, then discard a card.
{r}, {t}: Deal 1 damage to any target.
{1}{u/r}{u/r}, {t}: Create a Red and Blue 1/3 Spirit Creature Token.
{x}{x}{u/r}, {t}: Create an X/X Legendary Creature token with Hexproof, Prowess, and Ward {x} named Eternum, Beyond All Else on the battlefield tapped.