Mishra's Bauble by tapping and sacrificing it, looking at the top card of a player's library and drawing a card at the beginning of the next turn's upkeep.
Activate
Grinding Station by tapping it and sacrificing
Myr Retriever.
Myr Retriever triggers, returning
Mishra's Bauble from your graveyard to your hand.
Resolve the
Grinding Station ability, causing target player to mill three cards.
Cast
Mishra's Bauble by paying ({0} magic symbol) .
Teshar triggers, returning
Myr Retriever from your graveyard to the battlefield.
Grinding Station triggers twice, untapping itself.
Repeat.
Results
Infinite card draw at the beginning of the next upkeep step.