Ironically, this is probably the most powerful form Ultron has ever had, even though it only lasts for around a minute. Mysterium was only introduced to Marvel lore in 2020, so even letting Ultron ...

and it looks like they'll form a core part of his moveset in Marvel Rivals too - using a couple of imperative commands, Ultron will be able to send his drones out to support allies, providing healing.