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
If you do, search your deck for a Tool card and a Special Energy card and put them into your hand
Battles are decided entirely by which Digimon uses the stronger attack with no other effects coming into play, the game ends when one player's deck is emptied, and whoever has won the most battles at that time wins the game
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