Activate Malevolent Chandelier by paying 2, putting Orcish Bowmasters on the bottom of your library from your graveyard.
Activate Grenzo by paying 2, putting Orcish Bowmasters into your graveyard from the bottom of your library, and then putting it onto the battlefield.
When Orcish Bowmasters enters the battlefield, it triggers, dealing 1 damage to any target, then creating a 0/0 Orc Army creature token and putting a +1/+1 counter on it.
Activate Ashnod's Altar twice by sacrificing the Army and Orcish Bowmasters, adding CCCC.
Repeat.
This crafty loop turns the graveyard into a revolving door of damage, fueled by Ashnod's Altar providing the mana needed to keep the machinery moving. Once Grenzo, Dungeon Warden has enough power to reach your targets, he can repeatedly cheat out Orcish Bowmasters from the bottom of your library to trigger its entry damage and amass ability. Whenever the Bowmasters or the resulting Orc Army tokens hit the bin, Ashnod's Altar sacrifices them for raw colorless mana to feed Grenzo's ability and Malevolent Chandelier's recycling effect. Finally, Malevolent Chandelier acts as the crucial bridge that continuously tucks Orcish Bowmasters from the graveyard back to the bottom of the library, setting up the next iteration of the loop.