This creature has firebending 2 as long as there's a Lesson card in your graveyard. (Whenever this creature attacks, add RR. This mana lasts until end of combat.)
You must have a Lesson card in your graveyard while you attack with Fire Nation Cadets in order for the firebending 2 ability to trigger. If you put a Lesson card into your graveyard after Fire Nation Cadets has attacked, Fire Nation Cadets will still gain firebending 2, but the ability will not trigger.
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wotc
Multiple instances of firebending on the same creature trigger separately, each granting you the appropriate amount of mana.
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wotc
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.
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wotc
Firebending abilities aren't mana abilities. They use the stack and can be responded to.
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wotc
Any other mana you add during combat will still be lost as normal when moving between steps of combat.
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wotc
"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."