Yggdrasil, The World Tree

Enters the battlefield tapped. When it enters the battlefield create a 1/1 Ratatosk token, a 3/3 White Eagle token, a 5/10 Jormungund token, a 9/8 Nidhogg token, and four 3/4 Stag tokens
{t}: Add {s}{w}{w}{u}{u}{b}{b}{r}{r}{g}{g}
{t}{10}{b/r}{b/r}{b/r}:Destroy all permanents on the battlefield except Yggdrasil