jecht mtg card MTGNexus Jecht, Reluctant Guardian // Braska's

If they resolve a Wurmcoil it gets disgusting very quickly short of a few good exile, bounce and tap solutions

You can do something similar with Warp cards and a sacrifice outlet

If the target creature is copying something else (for example, if that creature is equipped by another Blade of Shared Souls), then the equipped creature becomes a copy of whatever the target creature copied

It's very strong with going wide like Mono-Red Aggro, Mono-Red Tokens, or alongside those themes not just as a Commander like Boros Aggro or Tokens

On the other hand, if Prototype Portal is still on the battlefield at this time but there is no exiled card (because, perhaps, Riftsweeper's ability caused the exiled card to be put into its owner's library), no token is created