Jace in hand or on the battlefield or in your graveyard or in your library.
All other permanents on the battlefield.
You have cast at least one instant or sorcery this turn.
You have at least three other cards in your graveyard if Maestros Charm is in your graveyard.
({U} magic symbol) ({B} magic symbol) ({R} magic symbol) plus an additional ({1} magic symbol) if Jace is not on the battlefield available.
Steps
At the beginning of your combat phase, Rionya triggers, creating at least two token copies of Storm-Kiln Artist.
Move to your post-combat main phase.
If Maestros Charm is in your hand, cast it by paying ({U} magic symbol) ({B} magic symbol) ({R} magic symbol) .
Otherwise, cast it from your graveyard for its escape cost by paying ({U} magic symbol) ({B} magic symbol) ({R} magic symbol) and exiling three cards from your graveyard, ensuring not to exile Jace if it is in your graveyard.
Each Storm-Kiln Artist triggers, creating at least three Treasure tokens.
Resolve Maestros Charm, causing you to look at the top five cards of your library, put one of them in your hand and put the rest into your graveyard.
If you don't have an empty library, activate three Treasure tokens by tapping and sacrificing them, adding ({U} magic symbol) ({B} magic symbol) ({R} magic symbol) .
Repeat from step 4 until you have an empty library.
If Jace is not on the battlefield, activate three Treasure tokens by tapping and sacrificing them, adding ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) .
If Jace is in your hand, cast it by paying ({1} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) .
If Jace is in your graveyard, cast it for its escape cost by paying ({1} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) and exiling three cards from your graveyard.
Activate Jace's first loyalty ability by putting a loyalty counter on it, causing target player to mill two cards and you to win the game due to drawing from an empty library.