Living Death + Archaeomancer + Great Whale + Altar of Dementia
Living Death
Archaeomancer
Great Whale
Altar of Dementia
Infinite blinking for all playersInfinite death triggersInfinite creature ETBInfinite creature LTBInfinite magecraft triggersInfinite mana lands you control can produceInfinite millInfinite creature sacrifice triggersInfinite self-millInfinite storm countInfinite untap of lands you control
How it works
Activate up to seven lands you control by tapping them, adding at least 3.
Activate Altar of Dementia twice by sacrificing Archaeomancer and Great Whale, causing target player to mill cards equal to Great Whale and Archaeomancer's power.
Cast Living Death by paying 3, causing each player to exile all creature cards from their graveyard, sacrifice all creatures they control, then return all cards exiled this way to the battlefield.
Archaeomancer and Great Whale enter the battlefield, triggering their abilities.
Resolve the Archaeomancer trigger, returning Living Death from your graveyard to your hand.
Resolve the Great Whale trigger, untapping up to seven lands you control.
Repeat.
If the seven lands can tap to produce at least 4, this combo nets infinite mana.