Mossborn Hydra + Agatha's Soul Cauldron + Fertilid + Crystalline Crawler
Mossborn Hydra
Agatha's Soul Cauldron
Fertilid
Crystalline Crawler
Requires
Mossborn Hydra must be on the battlefield.
Agatha's Soul Cauldron must be on the battlefield.
Fertilid must be in exile (exiled by Agatha's Soul Cauldron).
Crystalline Crawler must be in exile (exiled by Agatha's Soul Cauldron).
Mossborn Hydra has at least four +1/+1 counters on it.
Mana needed: 
Steps
- Activate Mossborn Hydra using Fertilid's ability by paying and removing a +1/+1 counter from it, causing you to search your library for a basic land card and put it onto the battlefield tapped.
- When the land enters the battlefield, Mossborn Hydra triggers, doubling the number of +1/+1 counters on it.
- Activate Mossborn Hydra twice using Crystalline Crawler's first ability by removing two +1/+1 counters from it, adding .
- Repeat until there are no basic lands in your library.
Results
Near-infinite colored mana. Put all basic land cards from your library onto the battlefield tapped. Near-infinite +1/+1 counters on Mossborn Hydra.
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