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Since you know you'll have access to your general (until someone tucks it, at least) it's often worth it to play cards that are specifically useful in combination with your general but not so much otherwise.

Some Generals have access to really powerful comboes of this type. This is the thread to talk about them.

To start off,

Tibor and Lumia + Charisma. T&L used to be the only option for a U/R EDH deck if you didn't want to run Niv Mizzet and risk everyone assuming you were playing combo.

That's not true anymore but this combo is still totally awesome. Deathtouch granting equipment works too but stealing everyone's creatures is so much cooler than just killing them and with Charisma you don't have to worry about giving T&L flying or losing it to its own ability.

Colfenor's Sapling + Gift of the Deity. Adds up to potentially a one sided boardwipe. Like putting Lure on a Sylvan Basilisk but the Sapling is Indestructible and sitting in the command zone when you start the game.

Now that I think about it, this would be strong with Glissa, the Traitor too.

One card I've found to be really good with Tibor and Lumia is Corrupted Conscience. While it's not really a combo, it gives U/R a good option for mass board control it doesn't really have access to otherwise.

Also good with Tibor and Lumia are cards that give all your creatures flying (obviously). Wonder is usually the easiest to run, but Homura, Human Ascendant is better for over-the-top EDH fun.

The Rancor isn't actually that relevant, it's just to help get the damage in because of Trample. Flying or Unblockable could easily be used in it's place, with the right commander. It's just there aren't many Indestructible legendaries.

A deck with Ulamog, The Infinte Gyre could do it... though that would likely be impossible to make due to mana issues...

EDIT: Ignore the "mana issues" claim. I'm totally making an EDH deck with Ulamog as my commander. And it's gonna PUKE mana.