Let’s have some fun!
Rubick but RNG. Takenon-ultimate spell from any hero that isnt the other 9
For this hero concept, the Support role is quite obvious, maybe Mid?
What would you name him/her
What would the hero shard/agha could be?
What item build would you try?
Combo and Counter?
Aghs could be a secondary ultimate same as the first. Or a skill called Loaded Dice that lets you target a hero a take one of their spells randomly instead.
Lore-wise, this could be someone from the Ultymir Archives, the organization Warlock comes from, that has the largest arcane archives; or, for a more powerful option, someone from The Quorum, the Senate of 31 wizards that rules Weeping Rose.
A name like Quorum Arcanist or Quorum Exile sounds cool.