I love that frothing anger in the artwork of Fanatical Fever
Instead, just playing it gets you a random one from your deck
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The life gain option on the card gives you so much security, like insurance, it is good to have but better not to need
Notable about Rootha is that she cares about the mana value, not the mana cost unlike some cards, which means that spells that reduce their cost are fine here, and that she only rewards one spell on your turn, so to maximize her you want to lean into those elements
Because this can hit Lands as well, you can very easily have turns where you basically cast your entire hand by untapping the correct Land