It has Lifelink, which allows you to sacrifice a creature and put a +1/+1 counter on each Vampire you control
Jonah Jameson Katara, the Fearless Spicy Oatmeal Pizza Unlucky Cabbage Merchant Courier of Comestibles Elektra, Daughter of the Hand Sokka, Bold Boomeranger Quicksilver, Brash Blur Hellcat, Undying Vigilante Tigra, Feline Fury
In Commander, it's absurd: you get four free spells, basically guaranteeing that you'll hit something good
If you can get him to stick around for a couple of turns though, youll most likely run away with the game
Another example is Storm, a mechanic that made spells that had a bigger effect the more spells that had been cast before them in a turn with each storm spell creating a copy of itself
Let us know what other tips you have for snagging deals or getting the most out of your cards (when selling them) in the comments below.