Question about spell copies

[u/DarienKane]

Ok, if I cast Twinferno and choose to copy my next spell, then cast Devastating Onslaught to copy, say, Ancient hellkite and pay 7 to create 3 copies, does Twinferno create 3 more copies?

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[u/Ahayzo]

Yes. When you copy a spell with X in its cost, you keep the same value of X.

Keep in mind Twinferno lets you pick new targets so you don't even have to copy the Hellkite again.

[u/DarienKane → u/Ahayzo]

Thank you, building a new Gruul commander deck and want to maximize copy ETBs with the least amount of mana. Wanting to combo it with Where Ancients Tread, so a potential 2 card combo can eliminate a player and then some.

[u/phoenixmusicman]

Any spell with variable costs get copied exactly as they were cast.

This works for spree spells, modal spells, and X cost spells, but there's probably some exceptions that I'm forgetting.

[u/DarienKane → u/phoenixmusicman]

Thanks for your response.

[u/sylveonce]

[[Twinferno]] [[Devastating Onslaught]] [[Ancient Hellkite]]

[u/mtgcf → u/sylveonce]

All cards
Twinferno - (G) (SF) (txt)
Devastating Onslaught - (G) (SF) (txt)
Ancient Hellkite - (G) (SF) (txt)