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Its mana cost is more restrictive than something like Cloud Key, and as an artifact creature with flying, Enthusiastic Mechanaut is one of the most easily removed permanents there is
Ramp This deck doesn't contain a hefty ramp package outside the standard set of mana rocks, but it doesn't need it: the deck runs a lot of low-cost spells with effects that work especially well with Deadpool, Trading Card, so the standard mana rock package (Sol Ring, Arcane Signet, and one more two-mana artifact) should be enough
In this case, you will still only have one (1) copy of the card
There are Walls, there are cards that let you give opponents some resources, and there are cards that let you steal most of those resources to snag the win