After you cast one of these double-faced cards, the spell goes on the stack with its front face up, and after it resolves, it enters the battlefield with its front face up
This legendary creature sits in the command zone, ready to be cast whenever you need it
Politics also comes into play - opponents may well save each other rather than see someone get knocked out by a pumped-up Skithiryx and have to sit around until the next game starts
Viable in multiple Magic formats, Harald fuels graveyard shenanigans while pumping elves on the battlefield
For example, if youre playing Jund it is likely that you already have some soft hate in the main deck in the form of Scavenging Ooze
And up through 2016, you had to run a Five Color deck in Commander to play it as it needs at least four colors of mana to run