Philosophically, we would always rather see more cards available for unrestricted play in Timeless. Practically, we can implement a restriction much more quickly than we can add new cards to the game.
If there was a problem developing slowly, we would probably look for venues to insert counter cards. If a problem sprang up quickly and needed immediate reaction (dominating the meta, ruining diversity, etc.), we would almost certainly need to restrict something to control it.
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