Aquarial Technique

Remove X +1/+1 counters from among creatures
you control: Add X colourless mana, and put a
drain counter on Aquarial Technique. X cannot
be zero. Activate only in your turn and only once
per turn.
At the beginning of your end step, if Aquarial
Technique has no drain counters on it, put a
+1/+1 counter on a creature you control.
Otherwise, remove all drain counters from it
and draw a card.