What makes the Shuriken so good is the massive power boost you could feasibly get off of it
He seems like a red version of Liliana of the Dark Realms, a Swamp fetcher and destroyer equal to your Swamp count that was also a four drop
They both have numerous modes that actually impact the game in important ways in their respective deck shells, and are almost never dead draws
Still, once it resolves, you can choose how to kill your opponent slowly by either casting spells from the top of their library without paying mana, shrinking their hand, killing their creatures, and, if they've survived long enough, exiling all their non-land permanents with the ultimate
what now
I can also honestly say this is one of the most fun decks Ive played in Standard in a long time