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Mikaeus, the Unhallowed Mikaeus, the Unhallowed was an early two-card combo boogieman in Commander

Similarly, if you sacrifice a creature to activate a mana ability while activating Heirloom Epic's ability, that creature won't be on the battlefield when you pay the ability's activation cost, so you won't be able to tap that creature rather than pay one of the mana in the activation cost

I also wanted to mention that Mana Crypt is in the Special Guests sheet for this set, which will hopefully make it a little bit easier to grab one

Legendary Artifact Strength-Testing Hammer Whenever equipped creature attacks, roll a six-sided die

Hopefully these options give you ideas on how to best handle your storage needs

If a spell has in its mana cost, use the value chosen for that X to determine the mana value of that spell