800.4a When a player leaves the game, all objects (see rule 109) owned by that player leave the game and any effects which give that player control of any objects or players end. Then, if that player controlled any objects on the stack not represented by cards, those objects cease to exist. Then, if there are any objects still controlled by that player, those objects are exiled.
Quote from tstorm823 »Chaos Warp - Good suggestion. Can be downright mean in conjunction with the Political Trickery trio (6 mana, get rid of an opponents land and get a random card from my deck).
Quote from Inchtall »Humble Defector might be worth a shot, as well as Perplexing Chimera.
Quote from DarklingScribe »I have yet to fully construct my Zedruu deck and am still trading cards for the pieces I need, but I just thought I'd point out that if you do decide to get a Mox Opal and Glimmervoid then you should put in Seat of the Synod, Ancient Den, and Great Furnace just as ways to easily up your artifact count (however they are vulnerable to getting killed by March of the Machines). Also a good, if slow, ramp combo is Crucible of Worlds and any fetchland (like Evolving wilds, Flooded Strand, or myriad landscape) Crucible is expensive though, and I'd only recommend trying it out if you already have one.
Other colorless ramp fun can be had by using Thawing Glaciers and Rings of Brighthearth for two lands an activation or you could use any way to untap the glaciers and reactivate it before it returns to your hand at the end of turn. A part of me feels like Amulet of Vigor would be fun here as well (and prove to have some weird interactions with other cards in the deck) but I don't know if it deserves a slot in the 99.
One other card I'd like to mention is Mycosynth Lattice. If you have one (as it is another expensive card not worth trading for unless you MUST have it) it something fun to experiment with. I know you play this deck in a group hug way, so I'd reccomend not playing the lattice with March of the Machines (a destroy all lands now and forever lockout) unless you float enough mana to follow it up with something like Descent of the Dragons and wipe the board giving everyone an army of flying 4/4 dragons (It sounds like it would be the most awesome boardwipe ever).