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Whenever it attacks, you put a creature from your hand onto the battlefield tapped and attacking which would then also trigger its abilities as well

Thanks in house judge Reyemile and the people from the MTG Judges Chat Discord for helping me with clarifying this and putting it in decently legible text

Emrakul, the Promised End saw competitive play across many formats (most recently in Historic) as a card worth building your deck around

NOTE: As of January 2024, Pokmon has begun ruling interactions by stating the game now does know the format, which results in a change in what cards are considered to have no effect