So far direct damage cards followed more or less the 1:1 formula.
We have Falcon Dive for 1F that deal 1 Damage.
Going to red we have Seifers Wrath which deals 2 Damage to a creature (and a potential 2 Damage to it’s owner) for 2F (needs 2 Moutains).
Then there is Flame Burst 3F (2 Mountains) which deals 3 Damage.
Firebomb for 4F (2 Mountains) which deals 4 Damage (but ony to creatures and structures)
And now there is Havoc for 5F (5 Mountains) which deals 9 Damage to a creature.
Sure, you need 5 Mountains. But the jump from 4 Damage for 4 Mana to 9 Damage for 5 Mana seems a bit excessive to me… opinions ?