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This is the definitive masterclass on the Prize Trade and its advanced application: Prize Mapping

In that case, Hulking Metamorph simply enters the battlefield as a 7/7 (or 3/3) artifact creature

Shinen of Life's Roar is another cute little 1 mana Green creature from my Multani, Maro-Sorcerer list that should work well here

There is definitely room for improvement, and I would argue you could go even lighter on the creatures, taking out some unnecessary ramp or even removing the Monarch mechanic entirely, and instead going with some additional enchantments or spells to really apply the pressure to your opponents