Most valuable Steam Siege cards (2016)

The most valuable Steam Siege card is Gardevoir-EX 116/114 at $98.10 for an ungraded Near Mint copy. The ten most valuable together come to $320.73, 77 % of the whole set's market value. Steam Siege is a 114-card expansion in the XY series, released 2016/08/03. Prices are TCGplayer market values and move daily; graded copies sell above them. The full list is on the Steam Siege card list.

Most valuable Steam Siege cards
#	Card	No.	Rarity	Market
1	Gardevoir-EX	116/114	Rare Secret	$98.10
2	M Gardevoir-EX	112/114	Rare Ultra	$53.99
3	Volcanion-EX	115/114	Rare Secret	$39.89
4	M Steelix-EX	109/114	Rare Ultra	$34.50
5	M Gardevoir-EX	79/114	Rare Holo EX	$23.27
6	Gardevoir-EX	111/114	Rare Ultra	$22.50
7	Steelix-EX	108/114	Rare Ultra	$19.45
8	Professor Sycamore	114/114	Rare Ultra	$10.51
9	M Steelix-EX	68/114	Rare Holo EX	$9.33
10	Magearna-EX	110/114	Rare Ultra	$9.19
11	Volcanion-EX	107/114	Rare Ultra	$8.69
12	Xerneas BREAK	82/114	Rare BREAK	$8.62
13	Yveltal BREAK	66/114	Rare BREAK	$8.12
14	Pokémon Ranger	113/114	Rare Ultra	$7.76
15	Hydreigon BREAK	87/114	Rare BREAK	$6.54
16	Gardevoir-EX	78/114	Rare Holo EX	$5.91
17	Talonflame BREAK	21/114	Rare BREAK	$5.00
18	Pyroar BREAK	24/114	Rare BREAK	$3.96
19	Clawitzer BREAK	35/114	Rare BREAK	$3.67
20	Volcanion-EX	26/114	Rare Holo EX	$3.06
21	Yanmega BREAK	8/114	Rare BREAK	$2.69
22	Steelix-EX	67/114	Rare Holo EX	$2.27
23	Azumarill	77/114	Uncommon	$1.61
24	Magearna-EX	75/114	Rare Holo EX	$1.52
25	Bisharp	64/114	Rare Holo	$1.21

See the most valuable card of every set and how to price your own copy.