Richard Garfield, Ph.D. [Unhinged] Morningtide Tokens that source deals double that

that source deals double that damage to that player or permanent instead

I knew he'd found his answer

Choose an instant or sorcery card exiled this way and copy it three times

Sacrifice Ratchet Bomb: Destroy each nonland permanent with mana value equal to the number of charge counters on Ratchet Bomb

but I can assure you

Richard Garfield, Ph.D. [Unhinged] Morningtide Tokens that source deals double thatSet: Unhinged Type: Legendary Creature Human Designer Rarity: Rare Cost: {3}{U}{U} You may play cards as though they were other cards of your choice with the same mana cost. You can't choose the same card twice. (Mana cost includes color.) And yea he doth spake: "Let there be Magic."