You control another creature that has exactly 6 power and that cannot be blocked by an opponent.
Mana Needed
({4} magic symbol) available.
Steps
If
The Aetherspark is in your graveyard, activate
Emry by tapping it, allowing you to cast
The Aetherspark from your graveyard this turn.
Cast
The Aetherspark either from your hand or from your graveyard by paying ({4} magic symbol) .
Activate
Brass Squire by tapping it, attaching
The Aetherspark to a creature you control that has exactly 6 power.
Deal combat damage to an opponent using the creature that has
The Aetherspark attached, triggering
The Aetherspark, putting six loyalty counters on it.
Activate
The Aetherspark's third loyalty ability by removing ten loyalty counters from it, adding ten ({R} magic symbol) .
The Aetherspark is put into your graveyard as a state-based action due to having 0 loyalty.
Activate
Aggravated Assault by paying ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) , causing you to untap all creatures you control and to get an additional combat and main phase after this one.