Forsaken Miner | Weapons Manufacturing | Phyrexian Altar (and two other cards)

Cards

Cast
Forsaken Miner by paying ({B} magic symbol) .
When
Forsaken Miner enters,
Weapons Manufacturing triggers.
Holding priority, activate
Phyrexian Altar by sacrificing
Forsaken Miner, adding ({B} magic symbol) .
Resolve the
Weapons Manufacturing trigger, creating a Munitions token.
The Munitions token enters and dies as a state-based action due to having 0 toughness, triggering its ability, targeting an opponent or a permanent an opponent controls.
When you commit that crime,
Forsaken Miner triggers, causing you to pay ({B} magic symbol) to return it from your graveyard to the battlefield.
Repeat from step 2.
Resolve all Munitions abilities, dealing infinite damage to opponents and/or permanents opponents control.

This combo has been estimated to be Exhibition (Bracket 1+).