The ability that defines Souls of the Lost's power and toughness works in all zones
It seems less good because Raise Dead, Disfigure and pay a life for a card are all one mana abilities and because they cover less of a range than the other Confluences
Sword of Sinew and Steel Planeswalker-specific removal is a little hard to come by, so Sword of Sinew and Steels effect makes it one of the better from its cycle
Madison Li is a strong option that ensures your Energy counters will never go to waste
Harmonic Sliver There are usually a lot of powerful artifacts and enchantments hanging around in Commander games, from benign but handy cards like mana rocks, to game-changing cards like Smothering Tithe
When the second ability tries to resolve, neither the power nor the toughness of the new creature is greater than that of the creature with evolve, so that ability does nothing