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Aang, Swift Savior / Aang and La, Oceans Fury Making Spell Queller a human and letting it target anything is nice, though airbending is only a temporary solution
They are limited to a maximum of four copies per deck, like other cards
On top of that, if your life total dips below 10 or so, it starts to look even worse
The only drawback is discarding an Energy after attacking, but Fire decks have plenty of acceleration tools, so it rarely feels punishing
That does require you to have access to both extra mana to cast multiple spells in a turn as well as lots of card draw to keep your hand full at all times