I think the rerolls to wound makes halberds and PW more viable, especially if you have alchemy as a second option.reroll to wound are kinda wasted on Great Weapons, but they do promote other weapon options which is needed in the army.
Anyway to answer the original question of this thread, make sure you have enough spells to cast in any turn. Once you have enough spells, try to plan your magic phase by thinking about what gives your opponent the most difficult choices (i.e. so that they don't have an obvious correct response). If you cast your best spell first make sure you use a lot of dice. If you cannot use a lot of dice for your best spell (because it's a bound spell!) then save it for later and cast your second best spell first.
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