When Myr Battlesphere enters the battlefield, it triggers, creating four 1/1 Myr artifact creature tokens.
Activate Goblin Bombardment four times by sacrificing Myr Battlesphere and three Myr tokens.
When Myr Battlesphere and the Myr tokens die, Demon of Dark Schemes' second ability and Pitiless Plunderer each trigger four times.
Resolve all Demon of Dark Schemes triggers, causing you to get EEEE.
Resolve all Pitiless Plunderer triggers, creating four Treasure artifact tokens.
Resolve all Goblin Bombardment abilities, dealing 4 damage to any target.
Activate three Treasures by tapping and sacrificing them, adding 2.
Activate Demon of Dark Schemes by paying 2 and EEEE, putting Myr Battlesphere from your graveyard onto the battlefield.
Repeat from step 2.
This loop transforms the mechanical army of Myr Battlesphere into an endless cycle of carnage by leveraging its initial entrance to flood the board with tokens. Goblin Bombardment provides the necessary outlet to sacrifice those creatures on demand, fueling Pitiless Plunderer to generate a steady stream of Treasure tokens while simultaneously feeding Demon of Dark Schemes the energy it needs to constantly reanimate the mighty construct. By recycling the mana from the Treasures and spending accumulated energy, you can repeat this entire sequence indefinitely to clear out any target and overwhelm the table.