This is why lands which enter tapped are written with a replacement effect instead of a triggered ability: if they came in untapped and then became tapped a moment later due to a trigger, there would still be a window where players could tap them from mana and negate this drawback
Especially if you played a bunch of Bloomburrow Draft or Sealed, you probably have a halfway decent start on the creature base you need for a deck like this
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They do nothing on their own, so only run them once your source-and-payoff core is solid