Because it automatically makes your monsters attack 100 points greater than the opposing monsters greatest stat, whether that be attack or defense
If Notorious Throng's prowl cost was paid, take an extra turn after this one
(Each opponent puts the top two cards of their library into their graveyard.) Illustrated by Martin de Diego Sdaba Standard Legal Alchemy Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
While in theory this can cause you to lose the game (as you saw in my match against Merfolk), the truth is it can almost always be played around, unless you run into the very rare situation where you have only the second Part the Waterveil left in hand and nothing to buy another turn, whether real or virtual
Another possible rule 0 breaker might be Gruesome Fate
What feels like immediately after the release of the Doctor Who Commander decks we get a first look at MTG Fallout followed by information on an MTG Marvel crossover designed to span multiple sets