Gitaxian Probe + Mishra's Bauble Let's put it this way: A cantrip that you can pay for with life rather than mana, and tells you what your foe's up to, is so fundamentally broken that Gitaxian Probe is banned in Modern and Legacy, and it's also restricted in Vintage, where it's no stranger to top-tier decks
Players start with 40 life instead, and the format favors mid-range or control strategies
Im no Lost Caverns Limited expert, but the cycle of Hidden lands saw some play, and it's generally useful to have 1-2 caves in your deck
He shuts down larger spells, hurts ramp, storm, buyback, my own Equinaut deck (which likes to play and replay creatures), and countless other decks that either want to cast something big or net multiple spells
That's just so sad
You can also combine Morophon with Fist of Suns or Jodah, Archmage Eternal to cast your dragons for free