The Bridge Cycle I love Darksteel Citadel and it gets played in decks outside of artifact themes because it cannot be destroyed by Armageddon or similar mass destruction, as well as Wasteland and Strip Mine proof, which is very valuable in metagames that care about LD and run it in numbers
On the other hand (as I mentioned a moment ago), I don't think Wizards can reprint the fake-card problem away
This allows you to build a pillow fort or assemble a combo to win out of nowhere
A transforming double-faced card enters with its front face up by default, unless a spell or ability instructs you to put it onto the battlefield transformed or you cast it transformed, in which case it enters with its back face up
My prediction may have missed the mark, but it wasnt by much, as sapphire lands itself in the Top 3, just behind amethyst and ruby
Talisman of Resilience , Reliquary Tower , and a Forest can all go too