Good combination there, by any chance do you play at York?
Advice wise it really depends on the strategies that you play, generally Sam is a glass cannon. The Executioner is a usually too slow but a good fire magnet. The handler is pure gold with at least 3 witchlings and who can say no to a cb7 angry bird?
For an 'all comers' I'd take a list like this
Sonnia,
Sam (8)
Witchling Handler (7)
3 X Witchlings (12)
2 X Dogs (6)
Would be 33 stones giving you 7 for Sonnia (6 from cache and leftover and 1 from the dogs)