Sharuum the Hegemon in hand or in the command zone.
Mana Needed
({3} magic symbol) ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) plus commander tax if applicable available.
Steps
Cast
Sharuum either from your hand or from the command zone by paying ({3} magic symbol) ({W} magic symbol) ({U} magic symbol) ({B} magic symbol) plus commander tax if applicable.
When
Sharuum enters the battlefield, it and
Grinding Station trigger, with
Sharuum targeting
Technomancer.
Resolve the
Grinding Station trigger, untapping it.
Holding priority, activate
Grinding Station by tapping it and sacrificing
Sharuum.
Resolve the
Sharuum trigger, returning
Technomancer from your graveyard to the battlefield.
When
Technomancer enters the battlefield, it and
Grinding Station trigger.
Resolve the
Grinding Station trigger, untapping it.
Holding priority, activate
Grinding Station by tapping it and sacrificing
Technomancer.
Resolve the
Technomancer trigger, causing you to mill three cards and return
Sharuum from your graveyard to the battlefield.
Repeat from step 2.
Results
Infinite LTB.
Infinite ETB.
Infinite sacrifice triggers.
Infinite death triggers.
Infinite mill.
Infinite self-mill.
Metadata
In 15 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Ruthless (Bracket 4+).