Scrap Trawler
Myr Retriever
Krark-Clan Ironworks
Umori, the Collector

   Prerequisites

What do I need to start this combo?
Scrap Trawler in your graveyard.
All other permanents on the battlefield (Umori with "Artifact" or "Creature" chosen on the battlefield).

   Steps

How does this combo work?
1
Activate Krark-Clan Ironworks by sacrificing Myr Retriever, adding .
2
When Myr Retriever dies, it triggers, returning Scrap Trawler from your graveyard to your hand.
3
Cast Scrap Trawler by paying its mana cost, which is reduced by Umori.
4
Activate Krark-Clan Ironworks by sacrificing Scrap Trawler, adding .
5
When Scrap Trawler dies, it triggers, returning Myr Retriever from your graveyard to your hand.
6
Cast Myr Retriever by paying its mana cost, which is reduced by Umori.
7
Repeat.

   Results

What do I get from this combo?
Infinite ETB
Infinite LTB
Infinite colorless mana
Infinite death triggers
Infinite sacrifice triggers
Infinite storm count
Umori, the Collector
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