Battle Angels of Tyr is an excellent threat that ensures youre catching up on all the pivotal resources, and it has relevant angel and knight creature types
Exhaust means you can only do it once per game, but blinking Loot, turning it into soup with Agatha's Soul Cauldron, or recasting him solves this problem
Using three ink and exerting the played Item will allow a player to take any Pirate card out of their discard pile and put it into their hand
These aren't the only appearances of these characters, however
Serra's Sanctum This card seems so incredibly niche but, in general, Serra's Sanctum is so powerful
However, there are far more opportunities for strategies to fall through and players to be left with no way of winning with the Emerald/Sapphire deck than there are with the Amber/Ruby one