Silver-bordered

Silver-bordered cards are not tournament-legal and are not covered by the comprehensive rules. Usually silver-bordered cards are printed in the so-called Un-sets. Certain promos like the Holiday cards, the 2017 HASCON promos, and Ponies: The Galloping also use a silver border.

Un-sets
Un-sets are named after their common naming pattern:
 * Unglued
 * Unhinged
 * Unstable
 * Unsanctioned

Mechanics
They feature mechanics that would be impossible to print in a normal expansion.

Rules
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Audience reaction
According to Mark Rosewater, the audience reaction to the silver border is somewhat of a problem for R&D. It most often doesn’t get treated as “this is a different subset of Magic”, but rather “this isn’t a real Magic card”.

Tokens
Tokens created by silver-bordered cards.