As long as The Aetherspark is attached to a creature, The Aetherspark can't be attacked and has "Whenever equipped creature deals combat damage during your turn, put that many loyalty counters on The Aetherspark."
[+1]: Attach The Aetherspark to up to one target creature you control. Put a +1/+1 counter on that creature.
NM-Mint Foil - $52.50
Lightly Played Foil - $49.90
Moderately Played Foil - $47.20
Heavily Played Foil - $42.00
Damaged Foil - $34.10
NM-Mint Foil Non English - $52.50
Lightly Played Foil Non English - $49.90
Moderately Played Foil Non English - $47.20
Heavily Played Foil Non English - $42.00
Damaged Foil Non English - $34.10