Activate Isochron Scepter by paying {2} and tapping it, casting a copy of Cabal Ritual without paying its mana cost.
Resolve Cabal Ritual, adding {B}{B}{B}{B}{B}.
Activate Onyx Talisman by paying {3}, untapping Isochron Scepter.
Repeat.

Infinite magecraft triggers

Infinite storm count

Isochron Scepter

Onyx Talisman

Cabal Ritual

Activate Cabal Coffers by paying {2} and tapping it, adding {B} for each Swamp you control.
Cast Lab Rats with buyback by paying {4}{B}.
Onyx Talisman triggers, causing you to pay {3} to untap Cabal Coffers.
Resolve Lab Rats, creating a 1/1 Rat creature token and returning Lab Rats to your hand.
Repeat.

Infinite creature ETB

Infinite creature tokens

Infinite mana permanents you control can produce

Cabal Coffers

Lab Rats

Activate Cabal Coffers by paying {2} and tapping it, adding {B} for each Swamp you control.
Cast Leshrac's Sigil by paying {B}{B}.
Onyx Talisman triggers, causing you to pay {3} to untap Cabal Coffers.
Activate Leshrac's Sigil by paying {B}{B}, returning it from the battlefield to your hand.
Repeat.

Leshrac's Sigil

Spend {2} and tap to activate Isochron Scepter, casting Songs of the Damned and triggering Onyx Talisman.
Pay {3} for the Onyx Talisman trigger, untapping Isochron Scepter.
Allow Songs of the Damned to resolve, adding at least 6 {B}.
Repeat for infinite {B}.

Infinite black mana

Songs of the Damned

Activate Ashnod's Altar by sacrificing Endless Cockroaches, adding {C}{C}.
Endless Cockroaches dies, returning itself from your graveyard to your hand.
Activate Cabal Coffers by paying {2} and tapping it, adding at least seven {B}.
Cast Endless Cockroaches by paying {1}{B}{B}.
Onyx Talisman triggers, causing you to pay {3} to untap Cabal Coffers.
Repeat.

Combos with "Onyx Talisman"