As mentioned, white has a lot of its life gain tied to Angels, but white-black can actually give you three other possible creatures to tie into your theme: Vampires, Clerics, or Bats
those cards that will move/rotate/flip when you open them
For collectors, this creates confidence
Each blocking creature can only block one attacker unless it has a special ability like "block any number of creatures." Blocker Assignment: The opponent places their blocking creatures in front of the attacking creatures to show which is blocking which
It's a Level Four, which is perfect to use as Synchro Material alongside Secret Six Samurai - Fuma, a combination many Duel Links players may be familiar with
Without it, you could be out both the card and the payment if something goes wrong, so always weigh the small upfront cost against the potential loss