Thanks to @Mayonnaisinator for these screenshots for the Item:Nullity's Mythic Cards (Level 160+).

Posting to confirm that the Item Card Variant code:0 is correct for this Item.

This is to avoid confusion or questions, because the Item:Nullity's Mythic Cards (Level 150+) has the Item Card Variant code:1. See details here.

Name:  Nullity's Muthic Cards, Level 160+ from Mayo.png
Views: 21
Size:  230.9 KB

Name:  Reliquary Item Card, 4 round version, Level 160 item, from Mayo.png
Views: 20
Size:  70.7 KB