Put a shield counter on a creature you control
Proliferation cards like Grateful Apparition , Thrummingbird , and Flux Channeler keep your planeswalkers loyal, while cards like Silent Arbiter, Norn's Annex , and Kazuul, Tyrant of the Cliffs keep opposing armies from spoiling your shindig
Theft is a key part of the blue/black Dimir decks (though it has spread to other colors) and is a very fun, if notorious, way to play Commander
Others will take some time to grow into their value, containing cards that are either unappreciated during their time in Standard, underappreciated until someone brews a new deck that utilizes them in a sanctioned format (Seasoned Dungeoneer and White Plume Adventurer, anyone?), or are in need of a card that has yet to be released to exercise their true potential
The deck is built on gravefillers and payoff cards
For such a low mana investment, lifelink and trample is incredible, and can help swing games with ease