all wheel cards mtg of Fortune Each player may exile their hand and draw X cards Wheel and Deal — All

Just like persist on Putrid Goblin, undying is easier to break than a porcelain vase in a Matrix movie

That makes playing aggressively against your rival players far less costly, but can also be used tactically to deliberately take characters off the table to reactivate their effects as they enter or leave play - as with Merlin, Goat above

There are many niche merfolk support cards that will basically only see the light of day for a product like this, so Wizards of the Coast had no reason to leave any of them in the vault unless they break the blue/green color identity (sorry Sygg)

Consuming Aberration is one of the notable exceptions