List of Super Combos

[Agrus Kos, Enforcer of Truth]

Borzhov Combo:
{Boros Reckoner}+{Indestructibility}, {Boros Charm}, something that gives indestructibility to Reckoner+{Anthem of Rakdos}=infinite damage combo
Say 1 damage is dealt to an indestructible {Boros Reckoner} with {Anthem of Rakdos} and Hellbent. You redirect it to Reckoner to do 2, direct it to Reckoner to do 4, 8, 16, 32, 64, 128, 256, 512...infinity and then target your opponent with the infinite damage.

Of course if you give Reckoner lifelink its an infinite lifegain combo too.

[rarehuntertay]

 {Traumatize} then  {Haunting Echoes}

[Deathseide]

{essence warden} + {Stuffy doll} + {Pariah's shield} + {druid's call}
Target yourself with the doll for infinite life and squirrel explosion... Hope you got a lot of nuts...

Was that a pun at the end?

Yep . 
Another combo:  {Fog bank} + {venom} + {valor made real}

[FreddyFlash]

{Living Plane}, {Zuran Orb}, {Fastbond}, {Enduring Renewal}

[Skribblings]

Ruby medallion + grinning ignus + any storm card

[LordJanova]

{Living Plane}, {Zuran Orb}, {Fastbond}, {Enduring Renewal}

That's really clever.

[Deebiia]

{Ruby medallion} + {grinning ignus} + any storm card

Curly brackets are your friend. {Grapeshot} is my suggestion since ruby medallion is in play.

[MarduArrow]

{Ruby medallion} + {grinning ignus} + any storm card

Curly brackets are your friend. {Grapeshot} is my suggestion since ruby medallion is in play.

This doesn't give you enough red mana

[Stromack]

{personal sanctuary} {mana barbs} {citadel of pain} gg

[Bilygote]

{Eater of the Dead} + {Gorgon Flail} + {Fire Whip}

[LordJanova]

{goblin sharpshooter} + {basilisk collar}