Show Only Guru Approved Combos
A Thief in the DarkDark Deal Buy + Notion Thief Buy
Here's one that will generate some hate...
Waste Not Want NotWaste Not Buy + Dark Deal Buy
Play Waste Not, play Dark Deal. Hopefully rinse and repeat.
Bearer of MY heavenBearer of the Heavens Buy + Boros Charm Buy + Flash Buy
So JujuJuju Bubble Buy + Channel Buy + Power Artifact Buy
Read the first comment for explanation.
The Great White HypePorcelain Legionnaire Buy + Palinchron Buy + Prime Speaker Zegana Buy
Porcelain Legionnaire is a stand in for Eldrazi Displacer from the new set (OGW, Rare).
She's no deadeye, but she's damn close.
mimic of the colossusBronze Sable Buy + Phyrexian Dreadnought Buy
Bronze Sable stands for Eldrazi Mimic (OGW rare).
So, you can either sac the mimic to feed the dreadnought or swing with a 12/12 mimic.
Warstorm SlaverWarstorm Surge Buy + Dread Slaver Buy
Cast Dread Slaver Buy and have it deal damage to itself via Warstorm Surge Buy
Furthermore you need something to kill Dread Slaver Buy repeatingly. You could use a sac engine like Viscera Seer Buy, Dimir House Guard Buy or Carrion Feeder Buy.
Every time Dread Slaver Buy dies it will return to the battlefield.
Legionnaire (sun)struck by a HelixSunstrike Legionnaire Buy + Retraction Helix Buy
Cast Retraction Helix Buy on Sunstrike Legionnaire Buy. This allows to go infinite; you just need a way to keep playing creatures. There are many ways to do so.
For example some cards that lead to infinite card drawing:
Vedalken Archmage Buy / Primordial Sage Buy + Ornithopter Buy / Phyrexian Walker Buy / Shield Sphere Buy
You could replace Sunstrike Legionnaire Buy with Midnight Guard Buy
Grim's Enduring PetGrim Haruspex Buy + Enduring Renewal Buy + Blood Pet Buy
Sac Blood Pet Buy for 1 mana; it returns to hand via Enduring Renewal Buy. Draw a card thanks to Grim Haruspex Buy (note: creatures will be discarded instead. Play Blood Pet Buy again and repeat endlessly.
Blood Pet Buy--> Wild Cantor Buy / Skirk Prospector Buy
Grim Haruspex Buy--> Dragon Appeasement Buy / River Kelpie Buy / Harvester of Souls Buy / Fecundity Buy
Altar of the Rising DragonBladewing the Risen Buy + Ashnod's Altar Buy + Nim Deathmantle Buy
MUST consist Scourge of Valkas
1. Bladewing MUST die with whatever trigger/effects
2. Nim Deathmantle Triggers, reanimate Bladewing (pay 4 mana)
3. Bladewing's Effect triggers, reanimate Scourge of Valkas; SoV deals 2 damage to target creature/ player.
4. Sacrifice SoV using Ashnod's Altar (add 2 colorless mana)
5. Sacrifice Bladewing the Risen (add 2 Colorless mana)
6. repeat step 2 - 5
Variance: add Dragon Tempest to add 5 more damage