It is slow indeed. I was met by the same choice. I picked higher magic lvl 1 first and then went the order route. The idea was that Flaming arrow is 5 mana and I can always slap the 2 post effects with those casts (flaming for 5 mana and poison skull).
However, if you feel that your green/red dragon is getting hammered, healing is the way to go.
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