Well, I manage to dig 3 times in most non-hero/map guard battles--start digging once the battle is well in hand(but way before they are down to just 1 troop). Having inquisitors helps (w/ 3x the rage boosting skill) + having points in the +% rage skill in the warrior tree.
Note that once you upgrade it to 3/2 at 13 cost, the -5 rage upgrade becomes available which can bring the cost back down to 8.
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