Aura of Conjure

Whenever you cast a green creature spell, put an
Aura counter on Aura of Conjure.
Return Aura of Conjur to its owner's hand: Add
an amount of green mana equal to the number of
Aura counters on this card. If this mana is used
to cast a spell without Conjure, Aura of Conjure
deals an amount of damage to you equal to that
spell's converted mana cost.
{g}{g}{g}, Discard Aura of Conjure: Draw a card.