Hi,
With my Seviper collection I only focus on regular & Jumbo sized TCG Seviper Cards, as well as TCG cards featuring Seviper in their artwork. (So this is excluding stickers, bandai and other cards, etc. and this does include all languages, stamps, misprints, etc.) Here in this Excel you can see my collection (in green), incoming cards (in yellow) and needed cards (in white).
I’ve also put a Wanted cards list in this thread which might be easier for some. I’ll try to update it regularly when I have new incoming cards. This version below is more updated than my Excel.
So, first of all the quality: My main preference is Ungraded M/NM, but any quality/grade will do, even if it’s heavy played/1.
All Seviper Cards I’m still looking for sorted per language:
(Added prices to give an idea of what I’m willing to spend for a M/NM copy, but it is of course negotiable. NOTE: Prices are including shipping towards me in The Netherlands.
I’m also willing to buy PSA-graded or played quality cards, but I prefer M/NM ungraded.)
English:- (18 USD) EX Emerald [75/106] - English with code 2SC-NZB-IJA at bottom-left corner { Battle Frontier }
Japanese:
- (18 USD) EX Holon Phantoms [003/015] - Japanese 1st edition
- (40 USD) EX Power Keepers [003/108] Champions Pack - Japanese unlimited edition
- (40 USD) EX Power Keepers [093/108] Champions Pack - Japanese unlimited edition { Battle Frontier }
Portuguese:- (8 USD) EX Emerald [75/106] - Portuguese with code 2SC-NZB-1E1 at bottom-left corner { Battle Frontier }
Do you know about a Seviper Card (perhaps misprint) that isn’t mentioned in my Excel yet, let me know (preferably with pictures if possible). If you want to sell one that isn’t on this list, even better. 
I also buy miscuts, crimped, square cut, and other misprinted Seviper Cards.
Greetz,
Quuador
Here is the artwork I’m talking about, with a Seviper as one of the attractions:
) I now need 22 out of the 129 Sevipers.