Re: Worthwhile summons (early to mid)
Short answer: most aren't worth it.
Long answer: with normal gold/gem frequency, it seems to me one gem is worth 25 gold. So for any summonable creature, ask yourself if it can defeat two of your enemy's normal troops, or one elite troop -- per gem cost.
If you're playing with more gems or less gold, summonables become much better. More gold or less gems, and they're only good for unique situations.
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