And of course he's a huge target the second he hits the board, but the fact the Cloud has haste and lets you auto-attach an equipment to him when he comes in mitigates the fact that you'll be the target here
If youve got a box sitting around that youve been meaning to sort through, bring it in
This is to say that, despite the cost that each draw minimally impacts the composition of the rest of the deck, this deck probably has better mana than a 60-card deck with one less color (Im not sure how problematic needing to fetch four colors instead of three will actually be to how games play out)
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If you cast a card with prototype for its alternate cost, that becomes the mana cost of the card