Your Favorite Common / Uncommon Combos -- Legacy and Standard.

ElfNeedsFood

Sphinx's Tutelage plus Chart a Course (or upgrade with Pull from Tomorrow with a Rare pairing)

TheExaminer

1. Cartouche of solidarity + equipment (dagger of the worthy is my favorite) -- decimates your opponents' creatures;
2. brawler's plate + murder investigation -- infinite berserking creatures;
   
3. lili's first ability + aftermath spells (consign/oblivion is my favorite) + removal and other sources of card denial -- this control shell is my first competitive deck ever, carried me through infinite number of overpowered bosses, her ability+oblivion is such a good one-two punch, it completely eliminates the chances of your opponent to do anything;
4. Gather the pack+embalm/eternalize+gem converters (thunderheard migration, beneath the sands etc);
5. Valor in Akros + any token producer (Awaken spells, Foundry of consuls etc) -- creatures get huuuge boost in power.

Sirchombli

Some disassembly required and gragraf harvest is fun. It's been my easy button for sacrifice objectives in legacy events. It's a little annoying to get set up, but once it's going it's pretty funny. 

Also a pretty big fan of gather/riddleform/scrapheap . Throw in dagger of the worthy or haunted cloak because blockers , and you've got a party. 

In my scrubby alt, where voltron is life ,  brawlers plate and dagger of the worthy is, literally , in every deck. 

TomB

Keeping it Common/Uncommon, Lone Rider/War Oracle + Serene Steward from back in the early days, and more currently Sphinx's Tutelage with any sort of card drawing or cycling (especially fun with Kiora and additional drain effects).

Snappyturtle

Forerunner of the Heralds+Jade Light Ranger with some type of berserker add-on. They grow too quick to die off and there is always a creature to summon if they get killed or bounced.