If any creature leaves your control, it will retain indestructible.
01-07-2013
wotc
Once Dauntless Escort's ability resolves, the set of creatures it affects is locked in. It won't affect creatures that enter the battlefield after the ability has finished resolving.
01-07-2013
wotc
Lethal damage and effects that say "destroy" won't cause a creature with indestructible to be put into the graveyard. However, a creature with indestructible can be put into the graveyard for a number of reasons. The most likely reasons are if it's sacrificed, if it's legendary and another legendary creature with the same name is controlled by the same player, or if its toughness is 0 or less.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.