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 - $9.50
Lightly Played - $8.50
Played - $6.60
Heavily Played - $5.70
Damaged - $4.80
Near Mint Non-English - $9.50
Lightly Played Non-English - $8.50
Played Non-English - $6.60
Heavily Played Non-English - $5.70
Damaged Non-English - $4.80