tmnt cards mtg MTG: Teenage Mutant Ninja Turtles - FOILS or Splinter—to customize your playstyle at the table Magic: The Gathering® | Teenage

This ability doesnt affect its color identity

One was the off-color activation cycle (twenty cards in all, as we had to have each guild work both directions)

You'll find the full developer post over at the official website, but if you're looking for the short version, here's a couple of choice quotes: "To affirm what we talked about back in September, a smarter system that provides what we have dubbed "duplicate protection" is still our top contender, and the current design space we're working with." "Okay, so we have the goals we want to accomplish, we have the problem space, and we have a system that will help us reach these goals

With Eternal Dominion, survival depends cards in other decks

I think the only Meren decks that don't want multiples of that effect is if they are building a very high powered list, where this kind of play 'isn't advancing your board' sufficiently