You have Uglúk of the White Hand but need support.
Look for Dunland Crebain or Smite the Deathless.
Material and a payoff for sacrificing. Amass normally grows one Army. Three amass cards do not automatically give you three creatures to sacrifice.
You already have Dunland Crebain.
Consider Improvised Club if it fills a useful job.
Crebain leaves two bodies. Sacrifice the Army to Club when four damage matters; your next amass spell can create a new Army. Uglúk receives two counters if that Orc dies.
The support is missing
Take castable creatures and answers. If the engine never arrives, use the good cards rather than forcing narrow support.