Cards like Blood Petal Celebramt Olivia's Attendants, Dominating Vampire, Welcoming Vampire, and Markov Purifier tend to blur together into one mass of brown and grey, especially when compared to standouts from the style like Cemetery Gatekeeper, Odric Blood Cursed, and Runo Stromkirk
You can see my upgrade article for Reap the Tides here, and Kristen Gregorys article for Arm for Battle here for some inspiration
For more continuous effects in white, youd be looking at creatures and effects that want battlefield presence
Its own bonus counters created from removing counters can be given to one of your other creatures you know, so Sin can inherit them twice over when it returns
This way, you can skip the underpowered ones and go straight to drawing three extra cards, particularly when Sapphire Medallion let you do it all on the cheap
Thanks to her No Place Id Rather Be ability, you can play her if shes in your discard