hidden gale
If you have a single source of Archon Blood, you can create a wand of Bless for 75 Binding Essence. Bless is a free action with 4 range that gives 2 Fortune, Strengthened, and Bolstered Resistance to the target unit. There's no reason not to mass produce these and equip them on all your heroes ASAP.
cold bison
yes its too good
frigid cosmos
Yes, its instacraft if possible.
hidden gale
Free action for it is strong but I think if it cost at least 2 infusion points, and maybe have a cooldown of 2 it would still be strong but possibly not an instant craft (at least in the early game). Late game it could still get spammed though.
If it cost 1 action the cooldown could stay at 1 but it should probably still cost 2 infusion points.
neat siren
Yeah, that needs to be worth more infusion points or require more materials.
Free actions are dangerous
grim kindle
Which is why talking now costs an action point.
Just throwing this out there bless costing more essence to craft seems the best option due to its power (making it a t3 item at minimum)
austere bramble
yeah, I would also preserve this as a free action, cause I feel it's useless at even 1 AP (heros have better things to do for 1 AP), but make it higher tier