Water World Knight

Converge -Search your library for a creature, instant, or sorcery card with mana value less
than or equal to the number of colors of mana
spent to cast this spell, exile that card, then
shuffle. You may cast that card without
paying its mana cost.
Water World Knights enters the battlefield with
X +1/+1 counters equal to the spells mana cost
you casted with converge.