While a very powerful spell that's brilliant for a go-wide deck, the high mana cost of Biorhythm, and the fact that it will sit in your hand, a dead card, for most of the game, has some suggesting it would now be fine in the format
All you have to do is pump it up with some equips, maybe a safe zone or two, and you are unstoppable
Sin, Spiras Punishment Sin, Spira's Punishment could be fine top-end for a self-mill deck that utilizes mechanics like delve or cards like Relic of Progenitus to sculpt the graveyard and give them plenty of control over what you get back
This is the time of year where content creators take a look back at the best new cards from the previous year
The strategy is to play cheap, evasive creatures on turn one, use them to get Yuriko into play on turn two, and then use cards like Brainstorm or Senseis Divining Top to manipulate the top of your library, ensuring you reveal a high-cost card like Draco (16 mana) or Blinkmoth Infusion (14 mana) to deal massive damage to the entire table at once.