I used a similar loadout for my OM.
Sentinel Reset switch
Epic Shard Generator with secondary Buildables reduction
Epic +Shield and +Shards OR an epic with Buildables reduction secondary.
It shines in Incursion, especially Overgrowth. In Meltdown I usually go with 0 Cost Shard Gen, 0 Cost Wrench, +1 Other. That’s usually enough for me to spam buildables from the get go and without having to leave the lane to farm shards that often (as well as allowing my team to get the shards for their loadouts). A builder who won’t be in lane much should probably not be hogging all the shards to activate their expensive building equipment when a VERY VERY cheap alternative is available.