So if you use any synchron monsters, love to synchro summon with just 1 card, or if you just like shiny cards
C Common XX-clusion X TRAP Counter When your opponent activates a monster effect in their hand: Negate that activation, then if they have any cards in their hand, you discard 1 card from their hand (of their choice)
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If its the third time, put a creature card from a graveyard onto the battlefield under your control
His inspiration for making it a proofreader came from the white activation that deleted letters from the names of permanents (the original version just hit permanents, but Ari later came up with the idea of adding players, as that seemed like it could lead to some fun interactions)
As always, Im sure some clever players will find a way to spoil this strategy