Aura of Enchant

Whenever an enchantment enters the battlefield,
put an Aura counter on Aura of Enchant.
Return Aura of Enchant to its owner's hand: Add
an amount of white mana equal to the number of
Aura counters on this card. If this mana is used
to cast a spell without Enchant, Aura of Enchant
deals an amount of damage to you equal to that
spell's converted mana cost.
{w}{w}{w}, Discard Aura of Enchant: Draw a card.