Sure, basic lands have their place, but it's far more satisfying (and powerful) to play a shock land or fetch land rather than a vanilla Island or Plains
Now, being the heathens that we are, WotC and the great majority of players aren't bothered if we have demons in the game
Proxy cards are not allowed in official tournaments and some causal players frown upon them as well
Thankfully, the player's Guest-Star Party Member composition includes one that can inflict Sleep, so if the player's battle party for some reason is not equipped with Idle Bubble (or does not have a Signature Move that inflicts Sleep), there is always a chance to escape if caught, even though the player has to contend with the guest's A.I
When Enduring Friendship dies, if it was a creature, return it to the battlefield under its owner's control