I've been keeping this a secret as I use it in my deck and it makes for a more powerful combo, not an infinite cheese combo, but an unintentional scaling issue that sometimes wins me games.

I have a red giant deck. One copy of fiends lash. One calamity bearer. Few other giant cards and minotaur mixed in. The issue really is how Fiend Lash does its damage. If the artifact is attached to a creature and that creature is dealt damage the artifact then deals damage equal to the power of your creature to target player. That's true for 95% of cases.

If you have Fiends Lash attached to any creature enhanced by a damage effect like Calamity Bearer it instead does double damage. Even though Calamity Bearers effect is "If a giant source you control does damage to a creature or player it deals double damage".. Fiend Lash is the thing that's supposed to be dealing the damage. Not the giant. So for some reason its counting the artifact as a giant because it's attached to one.