Entering tapped is too much of a downside for these to get much attention, but as you can see, you could clearly do worse
Earthcraft can easily go infinite with Wild Growth and Sacred Mesa
This starts a trend that affects basically all of the Tarkir: Dragonstorm new abilities: they were printed only on a handful of cards, which makes them artificially niche and obscure
So much so, that I think they risk hastening power creep by making the cards too competitively costed, and outmoding other options
Enchantment and artifact destruction, life gain, big tokens, reach, and trample are all effects well-established in green's arsenal
This guarantees that you will have enough land throughout the game