Draining Tripod

Flash
When Draining Tripod enters the battlefield,
counter target nonblue spell. Put X +1/+1
counters on Draining Tripod, where X is that
spell's mana value.
Remove X +1/+1 counters from this creature: X
is equal to the number of cards in your hand.
Return Draining Tripod from the battlefield to
your hand. Activate only as a sorcery.