To combat this, you can lower your decks ROAR by focusing more on your most explosive combo-based win cons, or by making sure every card in your deck either contributes directly to your main plan or interacts with theirs
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It is disturbing on all the levels
Changelings like Masked Vandal or Taurean Mauler will be the most likely culprits for your unexpected windfall, but keeping an eye on all creatures that enter the battlefield can still pay off in big ways for the right battlefield
MTG in the 90s was way more clunky
Even CongregateCongregate might be enough if an opponent has gone wild with token creation
