Shocking times for games changing rules suddenly. This also happened with Axie Infinity before, where they changed a number of mechanics so that all previous axies degrade in value. I believe this is their way to attract people buying the new ones.
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That kind of sounds like the way the older Splinterlands cards are pretty useless now. I think this land thing was a known event, but I don't have time to read all that stuff, so it took me by surprise.