discussed here is defined by game-defining twists in how the card game would evolve in the years which followed, or were simply powerful enough to serve as a warning for the future
In the recent SOS Pro Tour, Izzet didn't win first place, but it made up 50% of the meta, and every deck was designed with combatting it in mind
Zhulodok is a fantastic balance at its mana cost of
(When this Digimon attacks Security, increase the number it flips over by 1.) Metal Greymon Level 5 [When it attacks] [Once per turn] When this Digimon destroys your opponent's Digimon by battle, put this Digimon in the Active state
If a second Elesh Norn, Grand Cenobite comes under your control, you'll put one into its owner's graveyard due to the "legend rule" at the same time that any of your opponents' creatures getting -4/-4 are put into their owner's graveyard for having 0 or less toughness