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

Combos with "Merfolk Secretkeeper // Venture Deeper"