Conduit of Storms
Creature — Werewolf Horror
Whenever this creature attacks, add at the beginning of your next main phase this turn.
: Transform this creature.
It strikes with the fury of a tempest.
Conduit of Emrakul
Creature — Eldrazi Werewolf
Whenever this creature attacks, add 
at the beginning of your next main phase this turn.
As without, so within.
Raymond Swanland
Eldritch Moon (EMN)
• #124Rulings
You’ll add mana at the beginning of the next main phase whether or not Conduit of Storms (or Conduit of Emrakul) is still on the battlefield.
(wotc • 2025-01-24)
If Conduit of Storms attacks and you transform it into Conduit of Emrakul in response, you’ll add {R}, not {C}{C} and not {C}{C}{R}.
(wotc • 2025-01-24)
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Rulings
You’ll add mana at the beginning of the next main phase whether or not Conduit of Storms (or Conduit of Emrakul) is still on the battlefield.
(wotc • 2025-01-24)
If Conduit of Storms attacks and you transform it into Conduit of Emrakul in response, you’ll add {R}, not {C}{C} and not {C}{C}{R}.
(wotc • 2025-01-24)