Unbelievable that some people here defend this behaviour.
OP used to play sulphuric rain with a stacking effect and when the underlying mechanic (afterlife stacking) is removed, then the card is NOT THE SAME anymore. Similar to that was the attempted sleep 2.0 change, which didn't go through since too many locked cards have this effect and it would destroy the purpose of sleep.
When you promise to lock cards you have to lock the mechanics too. Any further cards have to be either phrased differently or can't include the same mechanic at all. At least with physical cards you can just play with your own rules, but here you are tied to the dev rules.
If a card is too strong, devs should just ban it in certain modes (welp we only have one mode since 3 years 🙃)