Himeko, Astral Navigator

Eminence — Whenever a creature you control enters, if Himeko is in the command zone or on the battlefield, that creature explores.

Your opponents can't cast spells during your turn.

When Himeko enters, Create a 7/7 Legendary colorless Vehicle artifact token named Astral Express with flying, indestructible and crew 4. It
has "At the beginning of your end step, discover 7."