Editors note: The following information has not yet been confirmed or denied by Wizards of the Coast (WotC) and should be treated as such until an official statement has been made
The card pool has ballooned out, punctuated by the printing of two excessively powerful Modern Horizons sets
And the commander, Zhulodok, Void Gorger, makes the top-end creatures even better by giving them double cascade
Part the Waterveil isnt a four-of in the deck, but it is vital in combining win condition and extra turn all into one, allowing the deck to cut more situational cards and function more smoothly
As for seeing ward across the table, you know there are hoops to jump through to get rid of something, but at least there's a chance
Creatures (13) Planeswalkers (4) Lands (23) Spells (20) A third reason is one Reid touched on years ago: their deck is so redundant that Thoughtseize just costs you mana and life for a trade when a different interactive card would also cost them mana and you no life