Itharis, primordial king

When this creature enters the battlefield tap all
untapped lands you control, then put X +1/+1
counters on this creature and create X 0/1
colorless spirit creature tokens where X is the
number of lands tapped in this way.
Other spirit creatures you control gain +2/+1
and "{t}: Add {1}, you may only use this mana to
cast spirit creatures or colorless spells."
{2}: Regenerate.