There are a lot of 2/3s and 3/3s in the format, so its important to have plenty of ways to get our creatures big enough to brawl
When Zur gets going, the game tilts fast in your favor
Between 1,000 and 5,000, or greater than that, like card shop levels
Exile all opponents' graveyards, then create X 0/1 black Thrull creature tokens, where X is the greatest power among creature cards exiled this way
This Special Illustration Rare card is numbered 269/193 in the set
Mana Crypt (Kaladesh Inventions Series) The most valuable Magic card not on the Reserved List, Mana Crypt is valuable for similar reasons as Mana Vault and Sol Ring: it can easily add a lot of extra mana to the mana pool and enable some explosive early plays in a game