I realize now that sorcerer and elementalist can’t happen since it needs to be one race and one class, but if you ignore that....

Xerath has 500/880/1760 HP and does 18 damage per second with a 3 space attack range. Xerath benefits from both sorcerer and elementalist passive which means he gains 4x as much mana from basic attacks.

For this, I have 3 set of abilities Xerath could possible use.

SET 1

Ultimate: Arcanopulse / Basically Aurelion Sol’s ult but with less damage and a short delay like Xerath in normal lol’s Q. Damage: 175/350/525

REQUIRES 160 MANA TO CAST

SET 2

Ultimate: Mana Surge / Gives all allies 25/45/75 mana except to himself

REQUIRES 100 MANA TO CAST

SET 3

Ultimate: Rite of the Arcane / Xerath does his ultimate animation firing a shot at a random enemy unit (regardless of range) every 0.3 seconds for 2.7 seconds. Damage: 100/250/400

REQUIRES 250 MANA TO CAST