Two Card Combos

[Freiza2]

Niv-Mizzet, the Firemind + Tandem Lookout, works great for self mill, too! //:-)

[Wally]

 {Corpsejack Menace} &  {Protean Hydra}

[taylorstauss]

{Leveler} and  {Laboratory Maniac}

This is so much better then mine

[FlickerYourOwnIdentity]

{Selective Memory}, {Labratory Maniac}

[Fondueky]

Rest in Peace + Mind Grind

[Raven316]

{breath of fire} + {master Warcraft}

[Malleo]

 {Enchanted Evening}+ {Ethereal Armor}
Or if you can pull of threshold I suggest  {Enchanted Evening}+ {Cleansing Meditation}

[Wackaman9001]

{Wild Pair} and {Primalcrux}, if you have nothing else in play, you get 2 14/14's for 6 {G}s

[Bman0121]

{Wild Pair} and {Primalcrux}, if you have nothing else in play, you get 2 14/14's for 6 {G}s

How does this work?

[Silent1236]

{Wild Pair} and {Primalcrux}, if you have nothing else in play, you get 2 14/14's for 6 {G}s

How does this work?

Have {Wild Pair} on the battlefield, then cast {Primalcrux}.  Then use {Wild Pair} to fetch another {Primalcrux}.  Now you've got two big nasties out for the price of one

[Wackaman9001]

Yeah, and 14/14 is baseline thohgh

[MuggyWuggy]

 {Hell's Caretaker} +  {Flayer of the Hatebound}

Goes even further with  {Scion of the Ur-Dragon} +  {Conspiracy}
Mill out all creatures, return one each upkeep, deal out free damage

[Avnger345]

 {Teferi's Puzzle Box} +  {Notion Thief}...   You start the draw phase by drawing a card, then puzzle box kicks in..  So your opponent will never have a card again

[Xaol]

Not sure if it's already been mentioned, but {Grindstone} + {Painter's Servant} is a pretty nice one.

[Bman0121]

 {Rest in Peace} and  {Misthollow Griffin}(or  {Energy Field} and  {Helm of Obedience})