Whilst being a vehicle version of the cloned creature might seem like a downside, that stops it from being removed by board wipes, or other sorcery-speed effects
I count: 38 lands and Ornithopter of Paradise, Burnished Hart, Palladium Myr, Scaretiller, Solemn Simulacrum, Geode Golem, Oblivion Sower, Ugin, the Ineffable, Everflowing Chalice, Sol Ring, Mind Stone, Thought Vessel, Unstable Obelisk, Worn Powerstone, Hedron Archive, Thran Dynamo, Forsaken Monument, Dreamstone Hedron, Darksteel Monolith 57 mana
The effect of Metamorphic Blast's first mode causes the target creature to lose its other colors and creature types
Hell yeah it is
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The application here to lands means you have a lot of extra utility if you end up with too many lands in your hand, but the lands themselves tend to be a bit slow