Examples of Subtype-Changing Cards There are some cards that do this kind of thing globally, like Arcane Adaptation and Leyline of Transformation
I might even consider enchantment-based haste effects like Rising of the Day and Nahiris Resolve
It seems somehow impure or greedy to use artifact ramp when you have the green ramp effects at your disposal
Then you can discard two cards at the beginning of your first main phase to return this to your hand from your graveyard, which is card disadvantage naturally but with madness, lands, discard triggers like Archfiend of Ifnir, and loads more, it's got value
Another angle are the WotC-designed eldrazi spawn and scion tokens that you create through cards like Pawn of Ulamog, Basking Broodscale, and Awakening Zone
There are a lot of different types of Commander decks and it can be daunting to decipher the golden ratio