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It won't copy any counters or stickers on that creature or any effects that have changed its power, toughness, types, color, and so on, and a creature becoming a copy doesn't remove any such counters or effects that are already applying to it

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So, a Ruby/Sapphire card that provides an ink ramp (a Sapphire hallmark) can be placed in a Ruby deck, providing more options and versatility

If your opponent has Detention Sphere, they can remove your Oblivion Ring with it, but they couldnt remove your Detention Sphere, so Detention Sphere is both better and worse in ways that generally seem to balance out

Then, the more you play, you slowly start to discover other resources and concepts as well

It gives you a cheap, small damage sweeper in the early game, or you can foretell it to be a more impactful sweeper later on