Altar of Dementia , Spawning Pit , Bloodthrone Vampire , Dross Hopper : A critical mass of sac outlets is important and though the creatures listed aren't exciting they're a lot better for rebuilding if your first boardstate gets broken up
Lose control of Temporary Lockdown, though, and everything you sent away comes right back into play
In either case, having lands with basic land types is helpful because they can be searched out with Krosan VergeKrosan Verge or FarseekFarseek
Journey into Nyx Standard | Eric Rill Planeswalkers (7) 1 Jace, Memory Adept 2 Elspeth, Sun's Champion 4 Jace, Architect of Thought Spells (26) 1 Negate 1 Syncopate 2 Celestial Flare 4 Azorius Charm 4 Dissolve 4 Sphinx's Revelation 4 Supreme Verdict 1 Banishing Light 4 Detention Sphere 1 Elixir of Immortality Lands (27) 5 Island 5 Plains 1 Temple of Deceit 1 Temple of Silence 3 Mutavault 4 Azorius Guildgate 4 Hallowed Fountain 4 Temple of Enlightenment Sideboard (15) 2 Nyx-Fleece Ram 1 Deicide 2 Celestial Flare 1 Aetherling 1 Blind Obedience 1 Dispel 1 Negate 1 Pithing Needle 2 Gainsay 3 Last Breath While he definitely fits there, Nyx-Fleece Ram has potential in a main-deck slot
If you have Metallic Mimic in play and cast something like Battle Screech, all the flying tokens enter with a +1/+1 counter, so it works wonders with go-wide decks
Proxy cards are not allowed generally but in certain conditions, it is allowed to include a proxy card in the deck of a player for a specific game by the judges making it an official proxy