mh3 play booster box Magic: The Gathering Modern Horizons 3 especially Limited format events Why are MH3 booster boxes

Gate Burst The front card of the event deck is discarded, a doom token is placed in every location in that neighbourhood, and finally the event discard pile is shuffled and placed on the back of the event deck

It searches their in-theme Field Spell, "Malefic World", protect Field Spells from targeted effects, replaces the "There can only be one "Malefic" monster" condition to a less restrictive one, and negates "Malefic" monsters in the Battle Phase (allowing other monsters to attack)

And thats before we consider what this can do when you Entomb something good first

This means that you could have four copies of each card in your deck once you got up to 60 cards in a deck

The decks I can remember that tried to build around them used a lot of targeted graveyard hate to remove the randomness for their ability