Whenever you roll Chaos, until a player planeswalks, you can't lose the game and your opponents can't win the game
Pact falls slightly behind its other zero-mana brethren due to its steep drawback: if you fail to pay the hefty five-mana rider on your next upkeep, you immediately lose
Then, whenever he quests, you can bring out an item from your hand for free
An effective manabase can't contain only taplands, but there's always room for a few, and the utility on Bojuka Bog makes it well worth being one of them
Very literally "better" Mulldrifter, which is already a great card, and not even "broken", which I wish more of these cards were a bit more like this
Your copy goes on the stack above the original spell