It's never good to limit your options, and indeed, there will come times when you should deviate from your original sideboarding plan
Adding mana rocks like Mana Crypt and Mana Vault will help speed up the initial ramping turns that are needed for this deck to start copying a ton of Adventure spells and bury your opponent in value
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This 5-Color (WUBRG) deck utilizes a hyper-aggressive "Sliver Tribal / Cascade" strategy
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The fact that you can cast The Goose Mother for just two mana, or three mana and not feel bad about it, makes this card much more tenable to modern-day Magic than Krasis ever was