Mark Rosewater's answer is is at best incomplete and missing nuance, and at worst totally wrong
Either you dont do a good enough job and you become borderline irrelevant, unable to keep up with the proactive engines of other decks
(AZORIOUS) MERFOLK: BIG WINNERS I say Azorius in brackets, because the UW Merfolk (or Bant Merfolk) decks are going to win the most from this update though any monoblue cards can absolutely find their way into the likes of Kumena, Hakbal or Svyelun
The card sells for $12,000 on average
The Secret Lair will be available in foil ($39.99) and non-foil ($29.99), and there'll also be both Japanese and English versions
And even in a stalemate, it can also produce a creature to break through an opponents defenses either by attacking a player directly or transforming into Zilortha and negating whatever blockers they might have