5 Jarad, Golgari Lich Lord + Jumbo Cactuar Send That Damage Right To The Face Attacking with Jumbo Cactuar makes him a 10,000/7, but for all that might, it can be blocked by a measly 1/1 token, and nothing will happen to all that damage
While there is technically no maximum to how large your deck can be (as long as you can shuffle it), youll likely want to stay right at the standard minimum of 60 cards
You will soon with Tajuru Paragon
You can dispose of creatures and planeswalkers this way and even destroy artifacts, but what about the other permanents
We will have games where we just don't get to 9 mana because we happened to shuffle up against a high-powered deck that is simply too fast, or a lower powered deck that got lucky and fired on all cylinders, winning the game way sooner than normal