Cosmotronic Blastseeker

When the blastseeker rolls damage for a spell, it can reroll up to four dice of damage. It must use the new dice.

The blastseeker makes one attack roll, ability check, or saving throw with advantage.

The blastseeker's innate spellcasting ability is Intelligence (spell save DC 14, +6 to hit with spell attacks). The blastseeker can innately cast the following spells, requiring no components other than its Izzet gear, which doesn't function for others:

2/day: fireball

3/day each: scorching ray, shield, thunderwave

Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (1d8 + 2) bludgeoning damage, or 7 (1d10 + 2) bludgeoning damage if used with two hands.