Ariel of the Havenwood

Flying.
Ariel enters the battlefield with a +1/+1 counter
on it for each mana spent to cast it.
Remove X +1/+1 counters from Ariel: Search
your library or graveyard for a card with converted mana X or less, reveal it, and put it
into your hand. If you searched your library this way, shuffle it. X cannot be 0