For instance, using Karns first power will drag mana away from you hand if there are cycle cards that will be exiled.
Same goes for cards like titan’s nest.
I haven’t tested all the other options, but grafdiggers cage comes to mind, disposess, Kaya’s ult ability etc
I like this new feature, are you sure it is a bug?
This issue is now under investigation.
Thank you for the feedback,
Marcela.
Couldn’t reproduce it.
The “mechanics” to exile cards, either from your hand or as an effect of a casted card seems to be (still) not really thought to the end..
For instance, when you cast any of the finales spells, that are going to exile themselves after being casted, still the jump-start cards in your GY receive mana from this exiling.
They also trigger e.g. bolas’ citadel what’s even going to result in taken damage, although the card says clearly “when you exile a card from your hand (…)”