All 7 Combos with Takenuma, Abandoned Mire

Circle of the Land Druid + Takenuma, Abandoned Mire + Pitiless Plunderer + Phyrexian Altar

Infinite Mana: Infinite ETB, Infinite LTB, Infinite colored mana, Infinite death triggers, Infinite sacrifice triggers, Infinite self-discard triggers, Infinite self-mill, Infinite storm count

Activate Phyrexian Altar by sacrificing Circle of the Land Druid, adding {1}. When Circle of the Land Druid dies, its second ability, Pitiless Plunderer and Pitiless Plunderer trigger. Resolve the Pitiless Plunderer trigger, creating a creature token. Resolve the Circle of the Land Druid trigger, returning Takenuma from your graveyard to your hand. Resolve the Pitiless Plunderer trigger, creating a Treasure token. Activate Phyrexian Altar by sacrificing the creature token, adding {1} When the creature token dies, Pitiless Plunderer triggers, creating a Treasure token. Activate the Treasures by tapping and sacrificing them, adding {B}{G}. Activate Takenuma's channel ability by paying at most {3}{B}, returning Circle of the Land Druid from your graveyard to your hand. Cast Circle of the Land Druid by paying {1}{G}. When Circle of the Land Druid enters, its first ability triggers, allowing you to mill four cards. Repeat.