You can spend five mana to exile a dork from our graveyard, make a 1/2 reaching Spider token, and then each foe loses life equal to our Spider count as a bit of a win-con there I adore
Dimir Guildmage deserves a special note for being able to eliminate your opponent's hand in the late game, while Cavern Harpy provides an easy combo to repeat your creatures' come-into-play effects
The signature lifegain kill
While you could run Reanimate in all three, I doubt Lazav cares about Cosmic Epiphany as much as Octavia does, while a card like Dread Return is probably easier to cast in Sidisi
1 Last March Of The Ents This spell does require setup in the form of possessing a creature with high toughness and also is susceptible to being blown out by instant speed removal
I can just use it, get a tiny bit of healing, and remove status conditions