shock ball + mark of blood = whole troop killed :)

[Celine]

Maybe with the dragon toy artifact you can do over 50% health damage with the lightning ball, and with the spell "mark of blood", the damage the troup receive is doubled, so if the lighning ball does 50% of damage, its doubled. 50% + 50% = 100% health of the troup, so all die.
I guess its possible