Magic R&D always sets out to make new set mechanics that are interesting to play and (usually) playable in the competitive sphere
Powerful cards youre looking for here are Skyclave Apparition, Emeria's Call, Omnath, Locus of Creation, and the cycle of Pathways
What makes them the best way to protect and organize your growing collection
No matter how good Double Fire is, with only 90 hp Simisear isn't going to last too long in the active Pokemon spot and if you don't have three energy cards on Simisear 20 damage every turn using Scratch isn't going to do much to an opposing stage 2 Pokemon
1 Urza, Lord Protector + The Mightstone And Weakstone = Urza, Planeswalker The hero of The Brothers War, Urza combines with the two stones that sparked the conflict with his brother, The Mightstone and Weakstone, to become the legendary Urza, Planeswalker