Urspeth, Peasant Hero

When Urspeth, Peasant Hero enters the battlefield, exile up to two target non-multicolored permanents.
When Urspeth, Peasant Hero leaves the battlefield, you may pay {x}. If you do, exile X target non-multicolored permanents and create X X/X multicolored Human Fighter tokens.
Evoke {3}{b/r}{r/g}{g/u}{u/b}