Permanents with Warp (and while they're mostly found on creatures, any permanent can have a Warp cost) allow you to cast them from your hand for their warp cost and exile it at the beginning of the next end step - remember, you can't cast for Warp as an instant ability unless the card has flash - which means these cards will usually have a nice enter the battlefield effect
In the spirit of Azorius, we're going to talk about the best of the best when it comes to blue and white in Commander
The legend is refered to by its full name for the first time
Ramp One of the main themes of the deck is ramping very quickly
Most of your creatures get a second use, keep your hand full and really make combat trades and conventional removal less effective
There are plenty of ways to make your creatures larger as well, from Longtusk Cub to Verdurous Gearhulk ,and Unsummon can make your hard work go away in an instant