When a monster would be Summoned, OR a Spell/Trap Card is activated: Pay half your Life Points; negate the Summon or activation, and if you do, destroy that card.
Solemn Judgment is by far one of the best cards in Yu-Gi-Oh!
You literally let GOD impose His will on your children’s card game (for a price of course), which in turn lets you counter so many types of card in the game. Just about every deck runs the lone, legal copy you are allowed as a staple. It’s such a game-changer.