Spread three other ninjas onto your battlefield and you turn player's life totals into a game of Fruit Ninja
The second reason is that the player base of Magic as a whole, and the players getting into Modern and Legacy specifically, has only increased since Modern Masters was released
Usually airborne and powered by White mana, these divine beings are a force to be reckoned with once you get them on the table
(5/3/2019) A noncreature permanent that turns into a creature can attack, and its abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of their most recent turn
BSJ will automatically reimburse administration and arbitrator fees for claims totaling less than $10,000 regardless of who the prevailing party is (unless the arbitrator determines the claims are frivolous), but BSJ will not pay for attorneys fees unless ordered to do so by the arbitrator
Six mana is a lot for an enchantment that does nothing with itself, but odds are if you get to untap with this then you win the game: Comet Storm or whatever burn spell of choice is gonna clean up the table real quick