Refactor "For each [...], its controller creates .. Token .." effects together

The more simple effects are being regrouped with #10834.

Cards like [[Terastodon]] or [[Curse of the Swine]] each do very similar things, and we could refactor them to share code. Might make batching of Token creation easier in the future (#10811), altough I do not know enough about how we do batch events to be sure.

[Scryfall search (copy ones are a different kind)](https://scryfall.com/search?q=o%3A%22for+each%22+o%3A%22Its+controller+creates+a%22&unique=cards&as=grid&order=name)