Atlantis, the Lost Continent

{t}: Add {2} to your mana pool.
{w}{u}{b}{r}{g}{t}: Add five mana of any color to your mana pool. Spend this mana only to cast a legendary creature spell.
{x}{t}: Create X 2/2 black, green, and blue Gyaos creature tokens with Flying and Haste. At the beginning of your end step, Populate. At the end of your turn, you take damage equal to the number of Gyaos tokens you control.