Boxes actually hold about 1,140 Magic cards, as MTG cards are thinner than baseball cards and those boxes were named after the number of standard baseball cards they hold
It comes from Mega Evolution's Chaos Rising expansion, which came out on May 22, 2026
And, because of this abhorrent marriage of card types and mechanics, there are so many ways to squeeze more value out of this than just drawing two cards or having a mini-annihilator in play
Its a lot like players who hit a wall with loot boxes
But this monster also has a once per turn quick effect where if your opponent activates a Spell/Trap or monster effect, you can send an Aqua monster from your hand or field to the graveyard to negate the activation, destroy that card, and then set it to your field