And unfortunately, Rush characters are fairly prevalent in the meta, especially Maui - Hero to All
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Obviously, this can be very oppressive when your opponent is cracking a fetchland or casting something like Cultivate, but you usually wont use Opposition Agent to stop something like that
Most control decks on the other hand are either going more the direction of the agro decks and getting card advantage alongside their other effects from cards like Consecrated Sphinx or planeswalkers or they are running a card advantage engine such as Life from the Loam
REAL As you can see on this example, the dots and lines are sharp as a knife
If you +1 when it enters, you can ultimate next turn and lose this card, or wait another turn if no one dings it