In the end, I believe the way for this deck to work (at least until we get another set) will be to find ways to leverage the powerful Giants-themed cards without having to play the suboptimal Giants themselves
Kai Budde won the Extended Pro Tour with his Necropotence-less blue-red deck
Kitesail Larcenist turns 3 artifacts/creatures into useless treasures (one for each opponent), and he can technically hit something of yours like a Fierce Empath or a Reclamation Sage after you're done with their etb effects but need a little extra mana to cast something big
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If you cast a spell "without paying its mana cost", you can't choose to cast it for any alternative costs
