Yggdris, the Wise Elder

Recall (Every card you put from the bottom of your
library to the top of your library while casting this
spell pays for {1})
{u/b}{u/b}, {t}: Add X mana of any color to your mana
pool where X is equal to the highest converted
mana cost of a permanent on the battlefield.
Until end of turn, creatures you control gain
Trample, Haste, and +X/+X.