You have Denethor, Ruling Steward but need support.
Look for Dunland Crebain or Shadow Summoning.
Useful creatures to trade or sacrifice. Denethor makes only one token at your end step. Sacrificing several creatures does not make several replacement Soldiers.
You already have Denethor, Ruling Steward.
Consider Shadow Summoning if it fills a useful job.
Summoning gives two flying tokens. When one dies, Denethor can replace it at your end step; his sacrifice ability can also drain the opponent when you have spare mana.
The support is missing
Take castable creatures and answers. If the engine never arrives, use the good cards rather than forcing narrow support.