>>536403725
Haste really isn't that good. It's a Concentration spell and it costs an Action to cast. Potions of Speed are superior, and the shorter duration usually isn't a real downside if you optimize well. Some of the Guild's traders also sell a pseudo-Potion of Speed consumable that costs no resources but only lasts 2 turns.
https://bg3.wiki/wiki/Terazul
Use at your own discretion, it can really break the game.