Utilizing token makers with delver seems counter-intuitive as, again, the cards that best support tokens are generally anthems which generally don't flip delver. Do we really want
Rally the Peasants or
Spear of Heliod in these decks?
Not every card in a delver deck needs to flip delver. The aim is to make delver fine in those decks because most of your threats are also instants/sorceries, so you could have a defensible threat density without making delver never flip.
If we have a deck of 2 delvers, 10
midnight hauntingish cards, and some other junk, I think both delver and spear would be fine. Maybe not
rally the peasants since only
young pyromancer ties this deck to red at the moment, but maybe other cards like it. Maybe
righteous charge?
The question now becomes, does anyone else want spear?
CML: Ponder can't be played in response to delver's trigger, and can't flip delver with cards already in your hand.
Also UG won't work with the cards magic has given us now, that doesn't stop everyone
There might be about 3 playable green spells which make tokens (
Call of the herd,
Symbol Status and
Sprout Swarm, by my count. Just think of Symbol Status as a multicolor friendly
Beacon of Creation, since it counts lands as well) but that in no way means there might not be in 5 years. Or fi I make a pile and add them to my cube (more likely)
I think Gravitational Shift might be too expensive for what you want it to do, and possibly too infest as well. Maybe
Favorable Winds?
Changeling Bob: the draw smoothing of cantrips should not be underestimated, and that's part of what makes them frustrating for the delver deck, since everyone else wants them slightly less than you!
The Guttersnipe/Pyromancer deck is already at least kinda a thing, but the problem is it's very threat light and a little parasitic, since only pyromancer and
runechanter's pike ever make their way into other decks.
Jason: Remember everyone, this means pro as in pro as in pro/con, not protection
It's something worth pursuing, but I haven't taken a good enough look at either CML's or your cube to judge. I'll take a look sometime.
FSR: I'm not so concerned with "damaging green's other decks" because they're usually really flexible. I don't have a green aggro thing, and ramp cares little for the precise difference between
sakura-tribe elder and
farseek. Pod might take a hit, but It would be very hard to take green down below a threshold of creatures for that to happen realistically. There might be a
vengevine kind of deck brewing, but I think there need to be a few more creatures like vengevine for me to support that kind of thing (The
commune with natures in my cube preformed badly
)