So non edged it lasts what 5-6 hrs which means the edge is extending the duration by possibly 50%. That is significant. Downtime on preps opens a whole heap of other options particularly around staying in the fight longer. You are also grossly overstating how effective level 1 dispel is.

Basically I come away reading this with you stating "Its to weak and costs to much" at the start "To make it grossly overpowered and cost nothing at the end". The only real improvement I can make on this is taking the edge should give you edge points so you can pick 20 more edges and 5 legacies.