Direct Challenge Deck Lending
Add an option to 'share' your decks with 'Direct Challenge' opponents allowing them to use the decks you have constructed, for the challenge only.
This would allow players new to Arena to be able to experience a greater variety of decks against their friends, without affecting the Wildcard/open play economy. This may also have positive effects for certain community tournaments hosted on Arena.
This mechanism exists in similar games, like Hearthstone, already.
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