Yshtola is a great option for those who want to chip away at their enemies health and be rewarded for it , or if you love FFXIV
While we typically see this kind of effect on enchantments a la Oblivion Ring, this ones a white artifact, which opens the door to interesting synergies with cards like Urza, Prince of Kroog and Queen Kayla bin-Kroog
However, now that the Modern format has sped up a bit, her four-cost mana value is a bit too slow
For Standard, I imagine Jeskai Ascendancy could easily be the centerpiece of a token-convoke deck that deploys Ascendancy, makes a bunch of tokens on turn 4 and wins with those and Ascendancy triggers on turn 5
When you mix it with Arcbond, a card that will do damage to all players when damage is dealt to a creature, you can generate infinite damage to everyone but you for a quick victory, so long as the equipped creature is indestructible