Sirus, Awakener of Worlds

As Sirus enters the battlefield, you may exile any
number of nontoken permanents you control.
Sirus gains a +1/+1 counter per exiled card.
{x}{u},{t}: Scry 3, then shuffle your library.
{x}{b},{t}: Destroy target nonland permanent.
{x}{r},{t}: Deal Y damage to a single target, where
Y is equal to Sirus's power.
Spend only {u}, {b}, or {r} on X. X is equal to the
number of times Sirus has been tapped.