That would be insane, right
For example, having an Urborg, Tomb of Yawgmoth in play adds the swamp land type to all your towns, and future town cards might have basic land types as well
If they're locked behind the mastery pass, you'll need to unlock enough mastery orbs to unlock each one, and it will likely only be possible to unlock enough if you buy the premium mastery pass
While that self-targeting is where the infinite Key combos came from, that's really not what Voltaic KeyVoltaic Key was ever used for, anyhow
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Adventures, after all, are commonly quite powerful thanks to their ability to essentially function as two cards in one