Shadowrath is lacking in cards that boost it's strength, so this is an idea for a potential uprade.
It grants shadowraths an ability. It has a 20 second cooldown, and if the shadowrath is attacked while the ability is ready, the ability will dodge and teleport the shadowrath towards the source of the attack. This works on any kind of attack, ranged or melee.
the upgrade has 3 tiers.
Tier 1: shadowrath's dodge has the range of a magikill
Tier 2: shadowrath's dodge has the range of a tdead
Tier 3: shadowrath's dodge has the range of an archidon, and if attacked by an eclipsor the shadowrath can move upwards and land one hit on it.
I believe an upgrade like this would help to give shadowrath a more unique role in combat, a nimble unit with flanking capabilities, as well as to give it some well-needed synergy, as shadowrath has no generals or upgrades at the moment and does not benefit from voltaic armour or projectile enchantments.