These scenarios came up against one of my opponents the other night during an event.
1. Shadow Self vs. Assault - My opponent had a creature next to Shadow Self with 7 damage. I ask the Tournament Organizer if it is possible to attack the neighbor that has 3 power with my Ancient Bear and effectively kill both creatures from the attack. They say that since the Assault is before fight, that would work as the Shadow Self would take 2 damage from assualt and die. Everyone agrees and we proceed.
This leads to a more interesting play a couple turns later that I am still not sure if it was resolved properly.
2. Shadow Self vs. Tendrils of Pain - I had forged a key on my previous turn and my opponent plays Tendrils of Pain with multiple creatures and multiple Shadow Self in between them with varying damage already. They start by dealing 1 damage to each creature, which deals enough to kill one of the Shadow Self. They put it in their discard pile and then deal 3 more damage to each of their remaining creatures, which kills a couple that were no longer protected. I say that doesn't seem right, and that I thought it would just deal 4 damage to everything once, leaving them with a bunch of dead Shadow Self and their other creatures still alive. They say that since there is the period, like in Key Hammer, you do the action of 1 damage then 3 damage. The Tournament Organizer was not much help in this one and we deferred to continue with the opponent's explanation since it was not beneficial to them to play it that way.
This of course made me think back to my previous question and if it was answered correctly.
The FAQ in KeyForge Compendium says the damage is dealt simultaneously, but not whether it is two instances of damage resolved one at a time, with damage checks in between, or if it is two sets of damage dealt or if it is just one set of damage for 4.
Thanks for any help you can point out.
https://keyforge-compendium.com/sets/1-cota/cards/64-tendrils-of-pain
https://keyforge-compendium.com/sets/1-cota/cards/310-shadow-self
https://keyforge-compendium.com/sets/1-cota/cards/345-ancient-bear