What is this card worth

Darksteel Citadel FDC 300 $0.52 Commander deck Darksteel Citadel PLST C14-290 $1 The List Darksteel Citadel MB2 107 $1 Darksteel Citadel BRC 180 $3 Retro frame Commander deck Darksteel Citadel EA1 EA1 20 No price yet Darksteel Citadel SLD 608 $23 - 28 Borderless Secret Lair Darksteel Citadel C21 285 $2 Commander deck Darksteel Citadel 2XM 315 $2 - 3 Darksteel Citadel PLST MM2-238 $1 The List Darksteel Citadel C18 241 $1 Commander deck Darksteel Citadel CM2 243 $1 Commander deck Darksteel Citadel DDU 65 $2 Darksteel Citadel C16 288 $1 Commander deck Darksteel Citadel MM2 238 $1 - 2 Darksteel Citadel C14 290 $2 Commander deck Darksteel Citadel M15 242 $1 - 3 Darksteel Citadel DDF 72 $2 Darksteel Citadel WC04 WC04 mb164 $8 Darksteel Citadel DST 164 $2 - 28