Activate Ashnod's Altar by sacrificing Merfolk Secretkeeper, adding {2}.
Cast Venture Deeper from your graveyard for its flashback cost by paying {1}, causing target player to mill four cards and exiling Venture Deeper.
Cast Merfolk Secretkeeper from exile by paying {1}.
Repeat.

Infinite card draw

Infinite colored mana

Infinite colorless mana

Infinite draw triggers

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite magecraft triggers

Infinite mill

Infinite creature sacrifice triggers

Infinite self-mill

Infinite storm count

Lier, Disciple of the Drowned

Merfolk Secretkeeper // Venture Deeper

Ashnod's Altar

Chromatic Orrery

Activate Phyrexian Altar by sacrificing Merfolk Secretkeeper, adding {U}.
Cast Venture Deeper for its flashback cost by paying {U}, causing target player to mill four cards, then exile Merfolk Secretkeeper.
Desecrated Tomb triggers, creating a 1/1 Bat token.
Activate Phyrexian Altar by sacrificing a Bat token, adding {U}.
Cast Merfolk Secretkeeper from exile by paying {U}.
Repeat.

Infinite creature tokens

Phyrexian Altar

Desecrated Tomb

Cast Fractured Identity by paying {3}{W}{U}, exiling Leyline of Sanctity and causing each opponent to create a token copy of it.
Cast Sky Swallower by paying {3}{U}{U}.
When Sky Swallower enters, it triggers, but you cannot target an opponent as they all have hexproof.
Cast Fractured Identity from your graveyard for its flashback cost by paying {3}{W}{U}, exiling Sky Swallower and causing each opponent to create a token copy of it.
When each opponent's Sky Swallower enters, they each trigger. Each opponent is forced to target you, as all other players have hexproof, giving you control of all their other permanents.

Gain control of all permanents

Mass Land Denial

Leyline of Sanctity

Sky Swallower

Fractured Identity

Mycosynth Lattice

Cast Seasonal Ritual either from your hand or from your graveyard for its flashback cost by paying {G}.
Swarm Intelligence triggers, copying Seasonal Ritual.
Resolve both Seasonal Rituals, adding {G}{G} and then exiling the original Seasonal ritual with the ability to cast it from exile later.
Cast Rosethorn Acolyte from exile by paying {2}{G}.
Activate Ashnod's Altar by sacrificing Rosethorn Acolyte.
Repeat.

Rosethorn Acolyte // Seasonal Ritual

Swarm Intelligence

Cast Rise of the Eldrazi either from your hand or from your graveyard for its flashback cost by paying {9}{C}{C}{C}, causing target player to draw four cards, and you to destroy target permanent, take an extra turn after this one and exile Rise of the Eldrazi.
Move to your next turn.
Activate Isochron Scepter by paying {2} and tapping it, casting a copy of Pull from Eternity without paying its mana cost.
Resolve the Pull from Eternity copy, putting Rise of the Eldrazi into your graveyard from exile.
Repeat.

Combos with "Lier, Disciple of the Drowned"