mtg arena card draw draws are allegedly rigged Five essential MTG card draw

Then next we have your foe's exiling the top card of their library instead of their regular card flow and also have to cast it this turn so it might not ever hurt them if it's castable and not a reaction like Counterspell

9 Swarmyard The overwhelming majority of Spider decks are two colors, which leaves room in the manabase for a few colorless utility lands

Even on its own, Denied

Though it hasnt arrived without some legal controversy, it appears to be an early hit, at least if the crushing lines it causes at game conventions are any indication, with fans waiting hours to get their hands on product and promotional cards