VintageFTW

It's hard to find any criticism for a deck that has top-eighted tons of Modern Grand Prix and Modern Pro Tours. However, I prefer Dispatch over Galvanic Blast just for the Tarmofoyfs and Scavenging Oozes that get out of range.

I would recommend Congregation at Dawn over Altar of Bone, to make the deck Modern-legal.

Angel's Grace and Isochron Scepter could definitely find a home in here. Isochron Scepter pairs up with one of your literally SIXTEEN damage-preventing instants.

Thanks! Tribal Aurochs is pretty unique, huh?

Making hot list! Congratulations!
I play against this monstrosity daily . . . it's brutal.

The ridiculously overpriced lands from Zendikar which read, "T, pay 1 Life, Sacrifice [CARDNAME]: search your library for a {basic land type 1) or a (basic land type 2) and put it into play. Shuffle your library." That way, two lands can enter your battlefield on a single turn.
Son muy, muy caros . . . it can be over $40 for one of them.

Shelldock Isle, too. I've seen too few people play that awesome card.

It might break the bank, but fetch lands let you use Hedron Crab twice per turn and make it easier to draw spells instead of dead land. Glimpse the Unthinkable is better than Breaking and Mind Sculpt. Wight of Precinct Six is significantly weaker in modern, where there are far fewer creatures and it usually just dies to Tarmogoyf. Visions of Beyond is a key player to refuel your hand. Paranoid Delusions is really unreliable in a format where it's really easy to kill or counter creatures. The most reliable mill decks in Modern are control decks that play a smaller-impact, more reliable mill cards like Hedron Crab, Nephalia Drownyard, Visions of Beyond, and Archive Trap.

Well, maybe you could run Rogue's Passage for Mirko Vosk, just in case your opponent has the skies covered.

Past in Flame is a late-game finisher, giving all your graveyard flashback, like Brainstorm, Preordain, Mizzium Mortars . . . Call to Mind can have some relevance, but it doesn't open up your whole graveyard like Past in Flame does.

Boomerang can bounce lands, and hooks up to Isochron Scepter to keep your opponent on three lands for a game. However, Tandem Lookout is ingenious; I'll put it in immediately.

Genius interactions between the atog and the ordeals!

You are dead wrong. Double strike means the creature deals both first strike and regular combat damage. So, during the first strike combat damage step, it deals damage to its target (the blocking creature or the defending player) equal to its power, then during regular combat damage step, it deal damage to its target equal to its power.

To simplify, during combat a creature with double strike will deal combat damage twice.

Trust me, I'm a Rules Advisor.

If you want to ramp, you can include Azorius, Selesnya, and SImic Signets which are all Modern-Legal.

Pulled off of Daily MTG? Brilliant.
I think if you play Cackling Counterpart on Precursor Golem, you end up with 8 Golems. Flash it back, you've got 26. Play Sigil Blessing? Swing with 26 196/196 golems. Play Sheltering Word? You gain 5096 life. Still not enough? Play Chorus of Might to make them all 222 tramples. Swing for 5,772 damage? Yes, please.

Rakdos Cackler is much more solid than Shred-Freak. It's a turn-1 play, something this deck does not have; it can come along with a Burning-Tree Emissary; it's a good aggressive play.

30 lands may be a little low. Otherwise, great!

Add Rancor and maybe some unblockable. One of Varolz's greatest weaknesses is that he can dock a massive amount of counters on different creatures, but without trample or lifelink or unblockable, they're not going to do much.

Burn at the Stake!

Look up Joel Lim's Reel Fish Deck. It's Legacy-legal (except for 4 cards) but won the Vintage tournament in Philadelphia.