Alternatively, you can keep the cards in the build, but change it to a different format to ensure validity, like changing the format from Standard to Historic or Timeless when a Standard set rotates out
There are a few hyper-specific cards that care about permanents transforming, like Corruption of Towashi and Cult of the Waxing Moon, but none that are too competitive in Commander
The level counters the card owns determine its power, toughness, and sometimes abilities
It's worth noting that aside from two reprints and a token, the rest of the cards are mechanically unique
they're perfect for building decks, playing games with friends, and are tons of fun to open
It can change the state of the game in a moment