Make is a channel spell!
1 to 5 sec channel time
Require 1 Soul Shard per sec to cast
Damage Calculation per sec of channel does the same as a cast of Malefic Rapture!
The Channeling animation could be similar to the old malefic Grasp where it will target all the enemy who are affected by your DoT.
If you have 5 Soul shards it would normally take you 7.5sec to cast 5 Malefic Rapture, but with this new channel spell you will be spending the 5 shard in 5sec.
You will be getting the exact same damage per soul shards but in 5 sec instead of 7.5sec which should help a little with our burst which isn’t looking good right now.
I won’t solve all affliction problem but I personally think that channelling feel better for an aff lock then casting (similar to how channelling drain soul feel better the casting shadow bolt)