Olivia, Crimson Bride Olivia, Crimson Bride works perfectly fine without other legends, but it incentivizes you to play a few extras
Even the Unlimited version, which was printed in enormous quantities compared to 1st Edition, commands prices that dwarf every other card in the set
Because when they are destroyed in battle, you can summon out Beagalltach, Aegis, or Achillles, each of which can be rather useful to have during the opponents turn
#2 So Wizards of the coast used their own holo pattern on another of their products
Signal Red to help protect my field on those turns I need to do minor commitments before I wombo combo, and BTS to help guard my field better
This is because the rules above recognize tapped and untapped as separate game states for objects, and formally recognize the transition between them as well