signal mantle
On September 20th's snapshot: The wording on The Lord of Pain is a bit confusing so I may be wrong on this but I cast my first spell and the Lord of Pain's controller targetted me, which I don't think they should be able to do. I interpret "Whenever a player casts their first spell each turn, choose another target player" to mean player who isn't the caster.
visual galleon
The Lord of Pain's last ability must target a player other than the one who cast the spell that caused the ability to trigger. That means that if it's just you and one other player in the game, you'll have to target yourself when that player casts their first spell each turn. (What did you expect? You summoned The Lord of Pain!)
from the release notes