I never get enough of a creature count for Oviya in this deck, and I want to spend the Energy in better ways than on Dynavolt Tower
Thornscape Apprentice is an early drop that provides some nice small effects for when you have extra mana available, and I also made room for a copy of Groundskeeper
If thats not your vibe, you can always swap to Don Andres, the Renegade, a Vampire Pirate who buffs creatures you control but dont actually own
Cards like Scavenging Ooze and Cling to Dust leverage this trigger to remove the undying creature from the graveyard with the trigger still on the stack, preventing it from returning
Archivist of Oghma already sees tons of play as a card draw engine that preys on the format's multiplayer, ramp/fetch land filled decks, and Wan Shi Tong is just an Archivist that doesn't fall off when you draw it turn 8