The first player to get enough Energy on their Pokemon gets to attack first and, in some cases, you can do this on your first turn
If you do, search your deck for a Tool card and a Special Energy card and put them into your hand
Expansion is going to function as an extra Negate in counterspell wars and do a beautiful Chemisters Insight impression when its caster is short on cards
Tanufel Rimespeaker would fit best in a midrange or control deck that is built around consistently casting spells with mana value 4 or greatersuch as big-spell control, ramp-control, or even certain Commander battlecruiser strategies where you naturally curve into impactful late-game threats and card-advantage engines
Runick revolves around setting up Runick Fountain in your Field Zone
Of course, as more MTG cards are released, more powerful enchantments can shine in Zur decks, but people usually prefer trying to build new brews rather than just reinventing the wheel