The green experiment never really gets past the early planning stages because a lot of what green offers is shaky and non-synergistic with the rest of the deck. Krosan Grip is as good as it gets, but pound-for-pound red is just better.
K-grips don't kill Delvers, counter Show and Tell, stop Delver, prevent Ancestral Visions, prevent Snapcasters, Snapcast at a reasonable cost themselves, target just anything for a Mentor trigger in a pinch, kill Jaces, 2-for-1 vs. Force of Will, and to top it all off they don't look as cool as Pyroblast (either old or new art).
Green's other traditional strengths (mana control and creatures) also don't add a ton of value to the deck. Aside from Thrun, whose cost is prohibitive, most green dudes don't compare particularly favorably to the white creatures we've always had access to, like Baneslayer Angel or Monastery Mentor. As for mana, Life from the Loam doesn't play nicely with Miracle spells and Top activations. You can try Exploration, but this messes up Engineered Explosives and doesn't really go too well with the mass of basics that Miracles usually runs.
If you really want to go in this direction, however, here are some Shardless Bant decks from 2014 that worked OK at least at that time.
http://www.channelfireball.com/artic...hardless-bant/
http://www.starcitygames.com/events/...ant_with_.html
...I don't know what's wrong with me, I've never been able to get Monastery Mentor (in Miracles) to be a card my opponents were frightened of. I've won a few games with him, sure, but he's never gotten me out of situations that a regular old Entreat wouldn't have. He was my mainstay all-star during the DTT days when he did all manner of work in an Esper shell.
Today will be my last attempt to make use of this creature, and this is being done totally on my faith in all you guys that this card is, in fact, good in Miracles (as it seems it must be). I'm going to try that Stoneforge Mystic version from the Brainstorm Show at the weekly in lieu of my own personal brand of enchantment Miracles, which at this point is so outlandish that one might reasonably respond "Is that even a real deck" upon viewing the decklist.