Refactor: CreateTokenEffect of X power and/or toughness token

There are many token creation effect that have some on-apply knowledge of token parameter.

I think we could have an effect to create those token along a dynamic value, in order to lessen the need for custom effect instantiating the tokens.

https://scryfall.com/search?q=o%3A%2Fcreate.*X%5C%2F.*token%2F+or+o%3A%2Fcreate.*.%5C%2FX*token%2F&unique=cards&as=grid&order=name

Start by reviewing the existing token creation effects and the Scryfall search linked in the issue to identify cases involving X power or toughness. Compare how those effects currently receive token parameters and define the shared behavior needed; done means the relevant cases can use the common effect without custom token-instantiating effects.

Written by the indexing model from the issue text.