Merfolk Secretkeeper Combos

Merfolk Secretkeeper has been printed in Throne of Eldraine, Throne of Eldraine, Magic Online Promos, and has 3 combos.

Lier, Disciple of the Drowned + Merfolk Secretkeeper + Phyrexian Altar

Combo result
Infinite mill. Infinite creature tokens. Infinite sacrifice triggers.
Prerequisites

All permanents on the battlefield.

Lier, Disciple of the Drowned + Merfolk Secretkeeper // Venture Deeper + Ashnod's Altar

Combo result
Infinite ETB. Infinite LTB. Infinite death triggers. Infinite sacrifice triggers. Infinite storm count. Infinite magecraft triggers. Infinite mill. Infinite self-mill.
Prerequisites

All permanents on the battlefield.

Merfolk Secretkeeper // Venture Deeper + Underworld Breach + Ashnod's Altar

Combo result
Infinite self-mill. Near-infinite ETB. Near-infinite LTB. Near-infinite death triggers. Near-infinite sacrifice triggers. Near-infinite mill. Near-infinite storm count. Near-infinite magecraft triggers.
Prerequisites

Merfolk Secretkeeper in your graveyard. All other permanents on the battlefield. You have at least three other cards in your graveyard. available.