Normally, Im not a fan of rolling a lot of dice, and Im pretty sure half the dice you roll when you cast this creature will just fall off the table
If it gains popularity in other constructed formats as some kind of a miraculous combo breaker, then it can go above $5 a piece
They're usually best used at end of turn on the turn before you, that way you can respond to anything that happens, and if you happen to have mana left over before your turn, draw some cards
2022-02-18 Although the Ninja is attacking, it was never declared as an attacking creature (for purposes of abilities that trigger whenever a creature attacks, for example)
What's the most expensive card we can steal
More Rares, Fewer Commons Play Boosters will have the possibility of opening up to four (4!) rare or mythic cards in a single pack, while Draft Boosters typically had a maximum of two