I'm Elena. I use the Air seal, or one of Siegfried's things (give me Air) and play Diving Wind Throw, a 9/3 5M9 throw. +1 damage, +1 speed, +1 damage, resolve attack.
Then proceed to play Descending Dragon Spear, which has a Temujin Combo. According to current rulings, this means that since the character I'm using is not the name on the keyword, the card is not considered to have the keyword.
So, this is when it gets weird. I have one momentum and share all three symbols with Descending Dragon Spear now. Can I, or can I not, use Elena's first E for +1 damage, second E for +1 speed, +1 damage, then Elena's third E by discarding a momentum, then adding the "Combo(Throw)" keyword and proceed later to give Descending Dragon Spear +9 damage by playing its Combo E now?
Same for the Algol Combo card, Alshain Najm?