Best Rare? Definitely Order of the White Lotus.
Rare cards are supposed to be powerful, a part of that means, a rare card can be under-costed for what it affects, that's a silly arguement, that said, Order of the White Lotus is WAY overpowered, and broken as crap.
(Though it doesn't make other shield cards pointless, you can't draw it nearly as often as you'd like, so others are still worth playing.)
Mojko, you thought the old Tax was broken.... and yet you let this slip by somehow? o.O