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 - £5.00
Lightly Played - £4.20
Moderately Played - £3.50
Heavily Played - £2.50
Damaged - £1.50
Near Mint Non English - £5.00
Lightly Played Non English - £4.20
Moderately Played Non English - £3.50
Heavily Played Non English - £2.50
Damaged Non English - £1.50
Foil Prices
Near Mint Foil - £6.60
Lightly Played Foil - £5.70
Moderately Played Foil - £4.70
Heavily Played Foil - £3.30
Damaged Foil - £2.00
Near Mint Foil Non English - £6.60
Lightly Played Foil Non English - £5.70
Moderately Played Foil Non English - £4.70
Heavily Played Foil Non English - £3.30
Damaged Foil Non English - £2.00