Whenever an opponent casts a noncreature spell, draw a card.
Discard three cards: Exile Nezahal. Return it to the battlefield tapped under its owner's control at the beginning of the next end step.
1/19/2018 Your maximum hand size is checked only during the cleanup step on your turn. If Nezahal’s last ability is activated before your turn’s end step, it will return before your next cleanup step and you’ll have no maximum hand size.
1/19/2018 Nezahal’s triggered ability resolves before the noncreature spell that caused it to trigger.
1/19/2018 Players can cast spells and activate abilities after Nezahal’s triggered ability resolves but before the spell that caused it to trigger does. Notably, the card you draw may be able to counter that spell or may be discarded to activate Nezahal’s last ability.
1/19/2018 After Nezahal returns to the battlefield, it will be a new object with no connection to the creature that was exiled. It won’t be in combat or have any additional abilities it may have had when it was exiled. Any +1/+1 counters on it or Auras attached to it are removed, and any Equipment will no longer be attached.