It was easy to imagine a turn 3 Gideon of the Trials making an emblem and then Pact of Negation being used to stop whatever potent play the opponent had to make, not to mention being able to make the same kind of play on turn 4 with a buffer in loyalty that meant that Lightning Bolt (already on the downswing as a card seeing play) wouldnt ruin your day
Warehouse Kitsune Mystic Kitsune Mystic Krark's Thumb Krark, the Thumbless Kuon, Ogre Ascendant Kuon, Ogre Ascendant Mana Clash Mana Crypt Mana Screw Mijae Djinn Mirror March
Theyre often crowned archenemy at more casual tables and can be hard to find a place for unless you intentionally power them down to find the right table
When you pair them with cards like Eternal Witness or Mystic Sanctuary, they become engines for complete control
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Theres also a fun little bonus card included, which can be handed to a player who loses a rules dispute at the table