Simply reduce your opponents life total as quickly as possible with all the burn spells, fast creatures, and other red spells in your library
Its reprint in MH3 brings it into Modern, although it's probably not going to see much Modern play except perhaps in some fringe decks
You essentially draw a card on attacks, but you get to cast that card for free if you built your deck with mostly odd mana value cards
Agatha of the Vile Cauldron This two-drop mythic Gruul 1/1 Human Warlock is my highest scoring Command Zone eligible leader
These are features of the card that give you extra things you can do with them, or change the rules of the game in some capacity
If your commander dies, you can pay life instead of commander tax, so recasting it isnt a big deal