Coming from what are known as Un-sets, silver-bordered cards are aimed at a casual, kitchen-table environment, and their main goal is to break as many Magic rules as possible, usually for comedic purposes
Its biggest downside is only drawing one card instead of two, so there are definitely situations where youd rather have Hedron Archive instead, especially in the late game
When Minsc & Boo, Timeless Heroes enters the battlefield and at the beginning of your upkeep, you may create Boo, a legendary 1/1 red Hamster creature token with trample and haste.+1: Put three +1/+1 counters on up to one target creature with trample or haste.2: Sacrifice a creature
DIY Pokmon Card Container : 6 Steps (with Pictures) - Instructables
Might be from the Neo Era sheets