Affinity, Artifact combo, and fast mana strategies all abused Mox Opal to accelerate far ahead of normal gameplay curves
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Because energy has limited outlets, youre either fitting this in a deck that gains life and wants to make and utilize energy throughout the game (and there are some powerful things you can do with buckets of energy), or youre taking the risk that this thing just gets Abraded before you can utilize it and leaves you with some useless energy counters
Youre putting up to four cards into the yard with this one, and most likely recurring a land too
B2B and Blood Moon are also difficult to tutor for compared to creatures, lands and artifacts
House's first ability to trigger