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This is especially true if youre playing a deck loaded up with creatures and other permanents with Enter the Battlefield abilities, as any targeted effect your opponent tries to use on your permanents is likely to let you rebuy an Enter the Battlefield

Deadly Dispute/Village Rites (etc.) There are a lot of effects like this, but these are the best of them

Three and Seven each care about artifacts in their own interesting, non-overlapping ways

Treasure cards have become ridiculously powerful in the Commander format

MTG Tap/Untap Decks Because all decks tap and untap permanents, building a whole deck based on this keyword action isnt viable

Rotation and erratas have been talked about, but many hoped for outright bans of certain staple cards that seem more powerful than they need to be