Nourishing Emptiness (Red)

If there are no attack action cards in your graveyard, this gets dominate and "When this hits, your hero gets +1

until end of turn."

The blue symbol on Nourishing Emptiness is Intellect. At the end of your turn you draw up to your hero’s intellect. (Before end of turn effects are gone)
This does not count attack action cards on the combat chain such as itself as they are not in the graveyard yet.
If dominate is gained while there are already 2 or more cards defending, the defending cards would not be affected. You would not be able to defend with future cards from hand.

Dominate - An attack that is difficult to defend. Cards with dominate cannot be defended with more than 1 card from the defending hero’s hand.

You can still defend with equipment and defense reactions played from arsenal in addition to up to 1 card from hand.
Playing a defense reaction from your hand counts towards the 1 card from your hand restriction. You cannot defend with a card in your hand then play a defense reaction from your hand.
You can still block with equipment and defense reactions played from arsenal in addition to up to 1 card from hand.

Cost2

Attack6

Defense3

PitchRed