Mulligans
We give Satyr one more chance to prove its worth, but it’s important to only run 1 copy of it since two is an overkill most of the times and reduces the odds of pulling vargoth initially.
Kaelthas COULD be part of the otk combo, but doesn’t have to be. I use him mostly as an early turn 5/6 UI to stabalize against aggro and fill our hand with good stuff. Ysiel is almost always, however, meant to be played as part of the core otk combo.
Pro tip: Never Jepetto without pulling Satyr and Vargoth since pulling them would feel really bad. Jepetto is meant to pull a 1 mana Aviana/Malygos/Kun for unconventional combos.