>>546262598
I'm going to crossthread my post since the previous thread is dead just in case anyone has found a different outcome.

TL;DR after experimenting it seems "converting a basic card into a neutral card" via event during a chaos run counts as both +10 (converting a card) and the cost of "removing a basic card" which is (20 + multiplier) so it's overall more expensive than just removing a card.
Number crunching on my post.

Anyone tested the cost of copying a card?