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Likewise with emblems, you need to have a death-triggering emblem for an extra triggered ability to happen

If you want to build a particular deck, all you have to do is upload or import the decklist into Arena's deck builder or put the deck together yourself

Transforming Double-Faced Cards: Double-faced cards return, allowing players to cast the front face for its mana cost and transform it to the back face upon meeting specific conditions

You can always cast zero-mana creatures for free so when they get bounced after being targeted with Cowardice on the battlefield and triggering Nadu, you can re-cast to repeat the process

But theres a payoff there that synergizes well