You may have Spark Double enter the battlefield as a copy of a creature or planeswalker you control, except it enters with an additional +1/+1 counter on it if it's a creature, it enters with an additional loyalty counter on it if it's a planeswalker, and it isn't legendary if that permanent is legendary.
Near Mint - $4.25
Lightly Played - $4.00
Moderately Played - $3.25
Heavily Played - $2.50
Damaged - $1.75
Near Mint Non-English - $4.25
Lightly Played Non-English - $4.00
Moderately Played Non-English - $3.25
Heavily Played Non-English - $2.50
Damaged Non-English - $1.75
Foil Prices
Near Mint Foil - $4.75
Lightly Played Foil - $4.50
Moderately Played Foil - $3.75
Heavily Played Foil - $3.00
Damaged Foil - $2.00
Near Mint Foil Non-English - $4.75
Lightly Played Foil Non-English - $4.50
Moderately Played Foil Non-English - $3.75
Heavily Played Foil Non-English - $3.00
Damaged Foil Non-English - $2.00