Any mana symbol in the card’s rules text (note, Reminder Text is not rules text, so the mana symbol in Extort’s reminder text does not count).
The word “Black” as in “create a Black zombie army token” does not implicate colour identity. So long as the remainder of the Amass card you wish to use is Red/Green, you can use that card with Samut.
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Caerwyn says... Accepted answer #1
There are three factors in deterring a card’s colour identity:
The word “Black” as in “create a Black zombie army token” does not implicate colour identity. So long as the remainder of the Amass card you wish to use is Red/Green, you can use that card with Samut.
May 25, 2019 12:22 p.m. Edited.