Azlask, the Swelling Scourge $19.50 Annihilator is a mechanic that, while generally balanced in the past, many players flat-out hate
The mechanic only gets stronger with time as Wizards prints more and more legendary creatures
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Abundant card draw and strong interactive spells are hallmarks of Azorius cards
While the transformation ability can provide value if achieved, more competitive options like Jace, Vryn's Prodigy or Snapcaster Mage may be better choices for similar effects in decks focusing on graveyard interaction and card advantage, depending on the specific strategy and format, making Emet-Selch potentially more of a fun, casual inclusion rather than a staple in competitive play
Ideally, the Control player gets their opponent to the point where they can no longer meaningfully do anything to advance their own win conditions or prevent the Control player from winning