Whoops, sorry--thought this was fight club. I'm an Esper boy, but sometimes the Gruul spirit just takes ahold of you, ya know?
In any case, good know know about the Edict being pretty good. I'll give it a spin and let you know how it goes for me!
Feed the Swarm is very awesome and pretty strong; however, my cube is low to the ground and doesn't have much incidental life gain. Changing either of those factors would radically change how effective it is. The Libation is a lot worse. (I think. I've not tried it in cube, but it was bad...
It's a lot less swingy than Dictate, so I've liked Force of Virtue a lot more. It makes playing it more of a tactical, advantage-gaining play than the I-win button that Dictate can often be.
Hope of Ghirapur can be really good at messing up an opponent's plan to counter your critters, so it winds up working a lot better than you might think. It's either that or the Chronomaton for me, but the Hope is a bit spicier (though more punishing towards control).
I know I'm not who you were asking, but I'm bored, so I hope this helps!
137 of the 475 cards in your sig's cube activate Teshar (okay, 136 without Mr. Bird), which is about 30% of your cube. I'd say he's a great choice for you, especially since your curve is particularly low to the ground...