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.
Near Mint - $33.50
Lightly Played - $31.75
Moderately Played - $26.75
Heavily Played - $20.00
Damaged - $16.75
Near Mint Non-English - $33.50
Lightly Played Non-English - $31.75
Moderately Played Non-English - $26.75
Heavily Played Non-English - $20.00
Damaged Non-English - $16.75
Foil Prices
Near Mint Foil - $43.75
Lightly Played Foil - $41.75
Moderately Played Foil - $35.00
Heavily Played Foil - $26.25
Damaged Foil - $22.00
Near Mint Foil Non-English - $43.75
Lightly Played Foil Non-English - $41.75
Moderately Played Foil Non-English - $35.00
Heavily Played Foil Non-English - $26.25
Damaged Foil Non-English - $22.00