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 - $40.80
Lightly Played Foil - $38.70
Moderately Played Foil - $36.70
Heavily Played Foil - $32.60
Damaged Foil - $26.50
NM-Mint Foil Non English - $40.80
Lightly Played Foil Non English - $38.70
Moderately Played Foil Non English - $36.70
Heavily Played Foil Non English - $32.60
Damaged Foil Non English - $26.50