Ancient Mummy card. Mummy card becomes less useful than it is now, and Ancient Mummy shields add Seeking Attack.
Angelic Protection[1]. Angel's Kiss, Reincarnation, Cardigan, and Guard depreciate, and Angelic Protection armor gives 900HP + 100SP + 3% level 1 Assumptio chance.
Angeling Pin. Angel's Dress depreciates in value, and Angeling Pin grants the extra 2 Int, 6 Luk, and 5 Flee.
Archdam card. Remove Freezer card and Permeter card requirements, both cards depreciate in value further. Heater and Archdam card increase in value and grant Holy armor and 10% extra cast time.
Burning Bow. Fire arrow requirement removed, Burning Bow increases in value.
Crab, Aster, Shell Fish cards. I don't even know where to begin with this one.
Cramp Card. Tarou card depreciates, Cramp card gives additional 3 Str.
Dragon Fly Card. Chonchon card depreciates in value ;_; Dragon Fly card gives additional 18 flee.
Eclipse card. Lunatic card depreciates, additional 18 flee.
Freezer card. Grants 10% more damage with Bash. Profit.
Freya's Shoes. Additional 5% HP and SP, +3 Agi. Falcon Muffler depreciates.
Goibne's Greaves. Remove them from the Goibne's set combo, they depreciate, Helm/Armor/Spaulders increase in value.
Grand Peco card. Def and Vit + 3, increases in value.
Green Ferus Card. Dex + 5, AV damage + 5%, Throw Arrow damage + 10%. Cruiser, Anolian, Alligator and Dragon Tail cards depreciate.
Grizzly card. Blind chance increased to 9%, Bigfoot card depreciates.
Holden card. Str +4, MaxHP/SP +7%, 20% more damage with Mammonite. Raggler, Zipper Bear, Muka, and Baby Leopard card depreciate.
Hyegun card. All stats +1, Bongun/Munak card depreciate.
Incubus card. Int + 1, MaxSP + 150, SP recovery +10%.
Succubus card. Vit + 1, MaxHP + 1000, HP recovery + 10%.
Injustice card. Zealotus card depreciates, Atk + 20 and Luk + 3.
Mastering card. Poring card depreciates. Flee rate + 18.
Merman card. Remove Cruiser card requirement, Cruiser card depreciates. Merman, Anolian, Alligator, and Dragon Tail cards increase in value. +20% long range damage, +5 agi, +3 dex, Seeking Attack + 20% chance.
Morpheus's Hood. Remove Morpheus's Ring and Bracelet requirements, both depreciate. Hood and Shawl increase, Int + 5 MDef + 11 MaxSP + 20% uninterruptable cast time and cast time + 25%.
Morrigane's Helm. Str+ 2, Luk+ 9, Crit+ 13, Atk+ 18, Perfect dodge + 13. Morrigane's Manteau, Belt, and Pendant all depreciate.
Nightmare Terror card. Curse chance increased to 9%. Value increases.
Owl Duke card. Autocast level 5 Lightning bolt at 2% chance when hit.
Ulle's Cap. Remove Odin's Blessing requirement, reduces SP consumption of skills by 10% when Dex>70
Undershirt[0]. Remove Pantie requirement, Agi+ 5 Flee +10.
Vagabond Wolf card. Remove Wolf card requirement, Flee + 18.
Vidar's Boots. Vit + 5, Max HP/SP +9%, HP/SP recovery + 10%. Vali's Manteau depreciates.
Vocal card. Flee + 18.
Waste Stove card. Remove Seal card requirement.
Most of the cards that will depreciate in value are not used frequently already. The loss of their value is far less than the increase of the buffed item's values.