There are probably a number of cool ways to set up board locks with this ability, but one of the most straightforward would be having Gerrard, Adarkar Valkyrie, Oblivion Stone/Nevinyrrals Disk, and Urabrask, the Hidden
The winner, by a cluster of what could be eyes, are the Regis from Astral Radiance
Escarpment Fortress While I wouldnt say Escarpment Fortress is an exciting card, it does seem like a solid workhorse for aggressive decks that might otherwise be desperate for card draw
Your spells are very low cost, so I don't see how Llanowar Elves are needed, try to get off them and use 4 Bassara Tower Archer, it seems she works a lot better than the troll, due she's constant hexproof and keeping good your green devotion
When this creature leaves the battlefield, return all cards exiled with it to the battlefield under their owners control