yugioh card that banishes all monsters Void Vanishment [BLTR-EN100] Secret Rare Angelechy Disturbance - Yu-Gi-Oh! Card

It's card advantage over time and immediately outclasses several pieces of equipment and effects out there

Orim's Chant is the Legacy equivalent of Silence

If Aerodactyl ex is knocked out, you can pop Marshadow into the active spot and their Revenge attack which normally deals just 40HP of damage will instead deal 100 damage that turn

If you don't control an Army, create a 0/0 black Orc Army creature token first.) Spells that were cast before Saruman the White count

In addition to that Boros is historically speaking a weak colour pair in Sealed as it lacks lategame and without clear, strong synergies to make up for the missing top-end, I would caution against going for Boros at your Pre-Release