Activate Patchwork Crawler using Mirror-Mad Phantasm's ability by paying {1}{U}, causing you to shuffle Patchwork Crawler into your library and mill all cards from your library.

Infinite self-mill

Patchwork Crawler

Mirror-Mad Phantasm

Activate Patchwork Crawler using Asmodeus' first ability by paying {B}{B}{B}, causing you to draw seven cards.
If Skirge Familiar is in your graveyard, activate Patchwork Crawler using Skirge Familiar's ability by discarding a card, adding {B}.
Otherwise, activate Skirge Familiar by discarding a card, adding {B}.
Repeat step 2 or 3 two additional times.
Repeat from step 1..

Infinite card draw

Infinite draw triggers

Infinite looting

Infinite self-discard triggers

Near-infinite black mana

Asmodeus the Archfiend

Skirge Familiar

Activate Patchwork Crawler using Zaxara's ability by tapping it, adding {U}{U}.
Activate Patchwork Crawler using Horseshoe Crab's ability by paying {U}, untapping Patchwork Crawler.
Repeat.

Infinite colored mana

Zaxara, the Exemplary

Horseshoe Crab

Activate Patchwork Crawler using Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it.
Activate Patchwork Crawler using Soul Diviner's ability by tapping it and removing a -1/-1 counter from it, causing you to draw a card.
Repeat.

Soul Diviner

Devoted Druid

Activate Patchwork Crawler using Cinderhaze Wretch's second ability by putting a -1/-1 counter on it, untapping it.
Activate Patchwork Crawler using Soul Diviner's ability by tapping it and removing a -1/-1 counter from it, causing you to draw a card.
Repeat.

Cinderhaze Wretch

Activate Patchwork Crawler using Llanowar Tribe's ability by tapping it, adding {G}{G}{G}.
Activate Patchwork Crawler using Pili-Pala's ability by paying {2} and untapping it, adding one mana of any color.
Repeat.

Pili-Pala

Llanowar Tribe

Activate Patchwork Crawler using Zaxara's ability by tapping it, adding {U}{U}.
Activate Patchwork Crawler using Morphling's first ability by paying {U}, untapping Patchwork Crawler.
Repeat.

Morphling

Activate Patchwork Crawler using Llanowar Scout's ability by tapping it, putting a land from your hand onto the battlefield.
If the land is mana-producing and enters the battlefield untapped, you may activate it by tapping it, adding at least {1}.
Activate Patchwork Crawler using Trench Behemoth's ability by returning the land from the battlefield to your hand, untapping Patchwork Crawler.
Repeat.

Infinite landfall triggers

Infinite mana lands you control that enter the battlefield untapped can produce

Trench Behemoth

Llanowar Scout

Activate Patchwork Crawler using Barrenton Medic's second ability by putting a -1/-1 counter on it, untapping it.
Activate Patchwork Crawler using Soul Diviner's ability by tapping it and removing a -1/-1 counter from it, causing you to draw a card.
Repeat.

Combos with "Patchwork Crawler"