pf2e.fyi
From Pathfinder Impossible Magic, which isn't enabled.

Overburn

FEAT 9

You engage your core, giving yourself more energy and speed for a fight. You gain haste as an innate arcane 3rd-rank spell that you can cast once per day. You can target only yourself with this spell.

Enhancement You instead can cast haste as a 7th-rank innate arcane spell once per day. You must be one of the targets of the spell.

Pathfinder Impossible MagicORC