Heaven Sent by paying ({U} magic symbol) ({R} magic symbol) .
Widespread Thieving and
Mirrormade trigger, creating two Treasure artifact tokens.
Activate the Treasures by tapping and sacrificing them, adding ({U} magic symbol) ({R} magic symbol) .
Resolve
Heaven Sent, choosing to have it enter the battlefield with three chapter counters on it due to its read ahead ability.
Heaven Sent's third chapter ability triggers, dealing 1 damage to each opponent, and causing you to draw seven cards if an opponent has 0 or less life, or otherwise exile
Heaven Sent with the ability to play it this turn.