Played Mo’arg Artificer and Combustion (target: Carnival Clown). It hit the target for 8 damage as it should, but excess damage effect didn’t proc (Clown was unbuffed - 4 health).
I have a feeling that Mo’arg Artificer might not work with Rolling Fireball as well, didn’t have an opportunity to test it yet.
Hey Nautilium,
The Mo’arg Artificer, doubles the damage that a minion will receive, it does not double the damage of the spell.
In your example, if the receiving minion had four health, Combustion deals exactly four damage, the minion receives eight damage with the Mo’arg Artificer down, but there is no actual excess damage from the spell.