As a result, many MTG players have been doing just that in both Commander and even Modern
When they arrive at the location they can still quest/challenge/sing/etc
Under the current rules (as of writing this blog post) both of them would simply die as a state-based action due to the planeswalker uniqueness rule, so nothing special happens
Zudem gibt es ein paar Besonderheiten, wie die automatischen Ressourcen, die Boden/Weltraum-Einheiten und den Anfhrer, die es besonders und sehr gut spielbar machen
For example, suppose you control Edgar, King of Figaro, Ral Zarek, and Chance Encounter (which has "Whenever you win a coin flip, put a luck counter on this enchantment.") and you activate Ral Zarek's last ability ("7: Flip five coins