overload cards

[Thegreatgonzo]

Card Type: Instant

Casting Cost: 1U

Oracle Text: Return target nonland permanent you don't control to its owner's hand.
Overload 6U (You may cast this spell for its overload cost. If you do, change its text by replacing all instances of "target" with "each.")

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How does overload interact with the cascade mechanic? Or a card like Isochron scepter or panoptic mirror?

Thanks in advance

[psyburat]

When you cast a card without paying its mana cost, you can't choose to pay alternate costs (like Overload or Evoke), only additional costs (like Entwine or Kicker).

[Thegreatgonzo]

Ok, I never paid attention to the difference between alternate and additional costs. Thanks for the answer.