Azula, On the Hunt
Firebending 2 (Whenever this creature attacks, add {R}{R}. This mana lasts until end of combat.) Whenever Azula attacks, you lose 1 life and create a Clue token. (It's an artifact with "{2}, Sacrifice this token: Draw a card.")
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Official rulings (7) · Scryfall
Any other mana you add during combat will still be lost as normal when moving between steps of combat.
Multiple instances of firebending on the same creature trigger separately, each granting you the appropriate amount of mana.
Mana from firebending abilities isn't lost until you leave combat and go to your second main phase. It can be used at any time during combat, even after combat damage has been dealt.
Clue tokens are artifact tokens with "{2}, Sacrifice this token: Draw a card."
Creating a Clue token this way isn't the same thing as investigating. Notably, an ability that triggers whenever you investigate won't trigger because of creating a Clue token this way.
Firebending abilities aren't mana abilities. They use the stack and can be responded to.
"Firebending N" is a keyword that represents the ability "Whenever this creature attacks, add N {R}. Until end of combat, you don't lose this mana as steps end."