Valakut, the Molten Pinnacle's triggered ability has an "intervening 'if' clause." That means (1) the ability won't trigger at all unless, at the time a Mountain enters under your control, you control five or more Mountains other than that new one, and (2) the ability will do nothing if you control fewer than five Mountains other than that new one by the time it resolves
Chittering Witch Rat tribal, rat tribal, rat tribal
It was a Sol Land, a land that adds 2 mana for Eldrazi, which was fine
6 Yzma, Alchemist Hopefully She Won't Mix Up The Vials This Yzma variant is a low-cost card, you only need two ink to bring her onto the board
A significant portion of the most valuable cards in that ecosystem are Japanese exclusives