Since you want to maximize your chances of drawing your best cards, its typically best to stick to the minimum number of cards in your deck
Providing one green mana for each creature you control, Gaeas Cradle is always useful and gets absurd in the right deck
In those four you can either find the answer to their threat and win from the value and control of the Jace or just find the things your deck does and win with those things
It is printed on the card it affects, or is granted to the token it affects by the effect that has created that token, or has been acquired by the object it affects through a copying or text-changing effect
To round out the deck, players added many of the generic Best cards in Standard. Coincidentally, many of these cards were available in Mono-Black
Cards with anti-blocking power can be challenging to block