I feel pumping Imaryll at instant speed - before combat damage is done - is likely the way to go, because that makes him less of a visible threat
On top of that, Emrakul never had to exist in a format with powerful graveyard hate along the lines of Rest in Peace, Leyline of the Void, or Scavenging Ooze, and the presence of those cards gives opposing decks much more ability to fight back against Emrakul
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It can also be used in many combo loops, which is handy, too
If they were to draw such specific answers in more generic situations, their oddball cards would be useless
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