I'm thinking of changing the cost to 3 for unupgraded, 2 for upgraded. (maybe 3/3)
Quintessence costs 4/3 and protects from pretty much anything. Comparing it to this: doesn't get hit by direct spells, no antimatter, no mutate, no poison (apart from carapace) etcetc.
Draconic Instinct is inferior to this in many ways, can only be cast on dragons. So the cost should reflect that.