Rydia of Mist

Whenever an Aura enters the battlefield under
your control, you gain 3 life and draw a card.
As long as Rydia of Mist is on the battlefield, creatures in your hand have Invoke {g/w}{g/w}{g/w}
(If you cast a card for its invoke cost, it's an Aura
spell with enchant creature. It becomes exiled if it's
not attached to a creature. The enchanted creature
gains the power and toughness plus all abilities.)