Repost:

If I were on wheels I'd be from the Pacific (???)
On paper I'm unisexed (Refererred to as 'it' in the scan data?)
my blood is unpollutable (Immune to poison)
and my gift will help you complete the set (card refining?)

My list has dwindled to Cockatrice, Elvoret, Gerogero, GIM47N, Hexadragon, Iguion, and Tri-Face.

I'll guess Elvoret.