When you gain a death shard, the growth increase from Morrigan's call does not update.
EG. you have 1 death shard. YOu cast Morri Call on a city. It gains +1 Growth.
You then get a 2nd Death shard. The city with the existing enchantment does not change it's growth rate.
You remove the enchantment, then recast Morri Call on the city. It gains +2 Growth.
