Many people overlook the obvious difference between this card and Lightning Bolt.
For example, if you play Avatar of Discord or other spells that require discarding, with a hand size of five, you can activate Madness and play Fiery Temper, ended up with two cards and six damage done (Avarar's 2 discard -> 2 Fiery Temper = 3 cards used total).
If you have Lightning Bolt instead and wants to do the same six damage, you ended up with zero cards in hand (Avatar itself + 2 discard + 2 lightning bolts = 5 cards used total).
Lightning Bolt, without a doubt, is stronger because it has no restriction, that does not make these two good comparison with each other. In the example above, Fiery Temper certain wins on card advantage.
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For example, if you play Avatar of Discord or other spells that require discarding, with a hand size of five, you can activate Madness and play Fiery Temper, ended up with two cards and six damage done (Avarar's 2 discard -> 2 Fiery Temper = 3 cards used total).
If you have Lightning Bolt instead and wants to do the same six damage, you ended up with zero cards in hand (Avatar itself + 2 discard + 2 lightning bolts = 5 cards used total).
Lightning Bolt, without a doubt, is stronger because it has no restriction, that does not make these two good comparison with each other. In the example above, Fiery Temper certain wins on card advantage.
4/5