If you don't know what exactly Belcher is and you wanna find out more about the archetype, check out my other Belcher articles posted on Mystical Teachings.
Before we go to the sideboard guide section, let’s focus on the environment Belcher is fighting right now and how it affects deckbuilding.

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Modern after Dominaria United
The metagame after the Dominaria United release is not fully established yet. So far we know that Leyline Binding is the most powerful card for Modern and it’s being tested in many different archetypes. Among all of them, the most successful ones are different variants of Creativity. The new addition of the powerful enchantment has pushed many (but not all) Creativity players into white. At this point, it’s either a four or five colour deck with many Triomes and all the best cards that can be cast by using the manabase centred around Mountains and Dwarven Mine. The question is which ones are the best. I think that we’ll ne...