I have a Fecund Greenshell deck by way of Phylath, World Sculptor. Do you have some mass higher-toughness token makers (besides Avenger of Zendikar) that I maybe didn't get to?
Sure thing! First is a proper answer to the question, and then some more esoteric ones.
Spider Fog! Nobody expects the Spider Fog, and it happens to create a bunch of 1/2s that trigger Greenshell. The bigger the attack, the more cards drawn... And if it happens to put enough lands into play to make you go over ten lands with Greenshell out, well, all the better.
Glimpse isn't as much a "mass" token maker, but it also is very versatile. Once you've done all your green ramping, it's a three mana draw three, right when you need it. Beforehand, it's a three mana make three 0/1s and also store some mana up for the next turn. Both of these are excellent, and anything in between still is, and it does all of these.
You know what has more toughness than power? Tarmogoyfs! Polygoyfs creates one to two copies of itself each time it attacks for free, and they WILL trigger Greenshell.
But what if we combined the previous two cards? Have Chittering Dispatcher, a 2/3 that creates at least two other 2/3s when it attacks and then another 2 or 3 0/1s as the myriad tokens poof away.
You know what has greater toughness than its power? Fecund Greenshell. What if... More Fecund Greenshells? Calamity does exactly that while also being a creature with higher toughness than power. Since each Greenshell sees two enter, a Calamity saddled with a Greenshell gets you SIX etb triggers of Greenshell, and that's without any other token making.
EDIT: I forgot Calamity creates the tokens sequentially because of the "Repeat this process" wording on it. So the second one doesn't see the first enter, and you'd only get FIVE Greenshell triggers. Clearly trash.
But we can go deeper. Calamity has that pesky "nonlegendary" text, but some other red clones don't have that limitation. They can either copy Greenshell before another spell triggering it and the copy... Or they can simply copy Phylath. It'll legend rule the copy away, or the real one to tuck it back to the command zone for a recast. Either way, welcome to mono-red blink, you just get the etb again!
