While the obvious first home for Urza's Cave is Tron decks as a failsafe for games where it's difficult to assemble the three Urza lands necessary for the strategy's explosive mana acceleration , it's also interesting to consider what else Urza's Cave can do in decks featuring Knight of the Reliquary, Elvish Reclaimer, and the Modern Horizons 3 reprint Sylvan Safekeeper
That meant that if you tapped Mana Crypt on your upkeep you didn't take any damage, so decks that could use the mana then could get two mana per turn for free
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You must still follow any relevant timing rules for the permanent spell you cast from exile
Our hope is this also makes things a lot clearer in terms of big game-ending cards and combos, explaining where they should show up
I don't quite know if Phlage is as strong as Uro or Kroxa, but a potentially reoccurring Lightning Helix on a 6/6 body is pretty scary