sentinels of the multiverse card sleeves Multiverse: Definitive Edition by GreaterThanGames — Kickstarter all with stunning foil treatment Sentinels of the Multiverse: Definitive

You can only Special Summon "Mekk-Knight Yellow Star" once per turn this way

Voidmage can provide a way to soft lock an opponent pretty effectively but this requires you to have reasonable board position and good amounts of blue mana

Sylvan Library synergizes perfectly with lifegain strategies and high life total commanders

Team Up is a modern set, so you shouldn't have issues finding this card in lightly played (LP) condition at minimum, with copies typically selling for around $20, while NM copies command a hefty premium, fetching the market price in most cases, though some copies haven't quite lived up to expectations

Theres a catch though: one of the monsters needs to be a Tuner , a special classification of monster