Activate Workhorse by removing a +1/+1 counter from it, adding {C}.
Repeat step 1 until Workhorse dies as a state-based action due to having 0 toughness.
Activate Tomb Trawler by paying {2}, putting Workhorse from your graveyard onto the bottom of your library.
Activate Grenzo by paying {2}, putting Workhorse from the bottom of your library into your graveyard, and then putting it onto the battlefield with four +1/+1 counters on it due to its static effect.
Repeat.

Infinite LTB

Infinite ETB

Infinite death triggers

Grenzo, Dungeon Warden

Workhorse

Tomb Trawler

Activate Tomb Trawler by paying {2}, putting Threefold Thunderhulk on the bottom of your library from your graveyard.
Activate Grenzo by paying {2}, putting Threefold Thunderhulk into your graveyard from the bottom of your library, and then putting it onto the battlefield.
When Threefold Thunderhulk enters the battlefield, it triggers, creating three 1/1 Gnome artifact creature tokens.
Activate Ashnod's Altar three times by sacrificing Threefold Thunderhulk and two Gnomes, adding six {C}.
Repeat.

Infinite sacrifice triggers

Infinite colorless mana

Threefold Thunderhulk

Ashnod's Altar

Activate Tomb Trawler by paying {2}, putting Orcish Bowmasters on the bottom of your library from your graveyard.
Activate Grenzo by paying {2}, putting Orcish Bowmasters into your graveyard from the bottom of your library, and then putting it onto the battlefield.
When Orcish Bowmasters enters the battlefield, it triggers, dealing 1 damage to any target, then creating a 0/0 Orc Army creature token and putting a +1/+1 counter on it.
Activate Ashnod's Altar twice by sacrificing the Army and Orcish Bowmasters, adding {C}{C}{C}{C}.
Repeat.

Infinite damage

Orcish Bowmasters

Activate Sunforger by paying {R}{W} and unattaching it, searching your library for Jeska's Will and casting it without paying its mana cost, adding at least six {R}.
Activate Sunforger's equip ability by paying {1}, attaching it to Zirda.
Activate Sunforger by paying {R}{W} and unattaching it, searching your library for Big Score and casting it without paying its mana cost and discarding a card.
Resolve Big Score, causing you to draw two cards and create two Treasures.
Activate Sunforger's equip ability by paying {1}, attaching it to Zirda.
Activate Tomb Trawler twice by paying {2}, putting Big Score and Jeska's Will from your graveyard onto the bottom of your library.
Activate two Treasures by tapping and sacrificing them, adding {W}{W}.
Repeat.

Infinite draw triggers

Near-infinite storm count

Near-infinite self-discard triggers

Near-infinite magecraft triggers

Near-infinite card draw

Near-infinite red mana

Zirda, the Dawnwaker

Sunforger

Big Score

Jeska's Will

Activate Sunforger by paying {R}{W} and unattaching it, searching your library for Jeska's Will and casting it without paying its mana cost, adding at least six {R}.
Activate Sunforger's equip ability by paying {1}, attaching it to Zirda.
Activate Sunforger by paying {R}{W} and unattaching it, searching your library for Unexpected Windfall and casting it without paying its mana cost and discarding a card.
Resolve Unexpected Windfall, causing you to draw two cards and create two Treasures.
Activate Sunforger's equip ability by paying {1}, attaching it to Zirda.
Activate Tomb Trawler twice by paying {2}, putting Unexpected Windfall and Jeska's Will from your graveyard onto the bottom of your library.
Activate two Treasures by tapping and sacrificing them, adding {W}{W}.
Repeat.

Unexpected Windfall

Cast Shrieking Drake by paying {U}.
Shrieking Drake's cascade ability from Abaddon the Despoiler triggers, causing you to cast Lotus Bloom from your library since it is the only valid card to cast.
Shrieking Drake enters the battlefield, triggering itself, returning itself to your hand.
Activate Lotus Bloom by tapping and sacrificing it, adding {U}{U}{U}.
Activate Tomb Trawler by paying {2}, putting Lotus Bloom from your graveyard on the bottom of your library.
Repeat.

Infinite storm count

Shrieking Drake

Abaddon the Despoiler

Lotus Bloom

Activate Ashnod's Altar by sacrificing another creature, adding {C}{C}.
When the creature dies, Extractor Demon triggers, causing you to mill two cards if your graveyard is empty, or causing an opponent to mill two cards otherwise.
If your library is empty, activate Tomb Trawler by paying {2}, putting a card from your graveyard onto the bottom of your library.
Tormod triggers, creating a 2/2 Zombie creature token.
Repeat.

Infinite mill

Infinite self-mill

Near-infinite colorless mana

Tormod, the Desecrator

Extractor Demon

Activate Ashnod's Altar by sacrificing another creature, adding {C}{C}.
When the creature dies, Extractor Demon triggers, causing you to mill two cards if your graveyard is empty, or causing an opponent to mill two cards otherwise.
If your library is empty, activate Tomb Trawler by paying {2}, putting a card from your graveyard onto the bottom of your library.
Quintorius triggers, creating a 3/2 Spirit creature token.
Repeat.

Quintorius, Field Historian

Activate Ashnod's Altar by sacrificing another creature, adding {C}{C}.
When the creature dies, Extractor Demon triggers, causing you to mill two cards if your graveyard is empty, or causing an opponent to mill two cards otherwise.
If your library is empty, activate Tomb Trawler by paying {2}, putting a card from your graveyard onto the bottom of your library.
Teval triggers, creating a 2/2 Zombie Druid creature token.
Repeat.

Combos with "Tomb Trawler"