Lets get into the specifics and the pitfalls
If you use the flashback version later on and copy it, you are getting TWENTY +1/+1 counters from just the flashback version by itself, ignoring the first casting
At present, only one has been announced the Mew ex, which is set for release in the Pokemon 151 set, due in August 2023
The nasty ruler of Wonderland makes several appearances in Rise of the Floodborn, but none are more scary than Queen of Hearts, Capricious Monarch
Things have ramped and ramped since then, and now we have MTG Commander focused sets (Commander Masters) and pre-cons with every Standard-legal set
The type of gameplay centered on each color remained consistent with how Five Magics had been and with how Magic: The Gathering would stay in the future, such as red representing aggressive attacks