As a general rule, you must do exactly what a card says unless the rule text says may
Maybe bouncing a FrogmiteFrogmite back and forth to make infinite tokens and sacrifice them all to win
However, this isn't a big deal since you can simply choose to let Uro, Titan of Nature's Wrath go to your graveyard rather than back to the command zone after it dies (probably from its self-sacrifice trigger) and then escape it into play, just like you would in Standard
One of the ideas we came up with in early Magic design is what we call iconic creatures
Remember, Lightning Bolt targets a location not the unit
Again, this whole affair ends with salty players, but with the fun bonus of a specific target to harass for it, which is just swell