[Autumn]

They are very efficient at what they do, targetting their momentum is probably not the play, as since they cost 1m, they're already at risk of hitting resists and potentially losing a turn if the user is not careful with them. On top of this, it would simply not become efficient at dealing with far ranged threats again, and you already do lose out on 5 skill slots for not going with a tome anyway, as well as the potentiality of your spells getting parried by Ring of Pearls and Ice Point Guard. (as well as meeting melee counters)

Instead, tapping into their duration, the farshot penalty or simply just their cooldown is a far safer option towards the balance of these abilities, though if a cooldown is introduced, I would recommend moving the aspect of Deploy Talis where you can remove them from the field to another skill that is only active while one is on the field. (Such as remove tali, 1m)