Exchange of spirit is currently used in a prominent speed duels deck. I understand the format isn't popular but resolving the effect can be time consuming and difficult manually, since unlike the physical card game you can't just swap your deck and gy. Probably fastest way to resolve is to banish your gy, then /mill your deck then add banished to deck, but even then moving a bunch of these cards around is difficult, especially when some cards are banished anyway in some of these games and thus it can be dangerous/easy for some unintended cards to get added back, etc.
I understand speed duels isn't high priority but considering this deck will now basically be around forever it would be nice if some command was added to resolve this effect.
