Dwarven Blastminer might be a sideboard card, but being able to pop annoying lands like Rogue's Passage, Maze of Ith or Nykthos, Shrine to Nyx and the like on the cheap is amazing
Overall, Dragonmaid is an intriguing archetype that many players have tried to make work as a pure archetype, but it is more effective as a useful engine
The likes of Tornadus and Virizion with free retreat is hard to stomach when you only have Terrakion to help and you find yourself relying on Crushing Hammer/hand disruption to stand a chance in the prize race (and both being so easy to tech to counter your whole deck)
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If Wizards wanted, they could just make new cards that are functionally identical to old silver-bordered MTG cards
When your Blitz Pile has been exhausted, you've won