Here are a few examples of commanders that have such abilities: Squee, the Immortal Squee, Goblin Nabob Hogaak, Arisen Necropolis Norin the Wary The Indomitable Jarad, Golgari Lich Lord Built-In Cost Reduction Using a commander like Ghalta, Primal Hunger or The Pride of Hull Clade helps you get around commander tax by reducing your commanders cost
As you play, power up your creatures with +1/+1 counters to build an unstoppable squad
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Put the cards in that pile into your hand and the rest on the bottom of your library in any order
You can use this after a boardwipe to mess with your opponents top deck and ensure all they get is their early game creatures they no longer need
While this does mean you can only get an extra attack every other turn, it gives you plenty of time to build up your forces for the next major attack