Populate. Creatures you control gain indestructible until end of turn. (To populate, put a token onto the battlefield that's a copy of a creature token you control. Damage and effects that say "destroy" don't destroy creatures with indestructible.)
4/15/2013 You can choose any creature token you control for populate. If a spell or ability puts a token onto the battlefield under your control and then instructs you to populate (as Coursers' Accord does), you may choose to copy the token you just created, or you may choose to copy another creature token you control.
4/15/2013 If you choose to copy a creature token that's a copy of another creature, the new creature token will copy the characteristics of whatever the original token is copying.
4/15/2013 The new creature token copies the characteristics of the original token as stated by the effect that put the original token onto the battlefield.
4/15/2013 The new token doesn't copy whether the original token is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, or any noncopy effects that have changed its power, toughness, color, and so on.
4/15/2013 Any “as [this creature] enters the battlefield” or “[this creature] enters the battlefield with” abilities of the new token will work.
4/15/2013 If you control no creature tokens when you populate, nothing will happen.
7/1/2013 The creature token you put onto the battlefield will also have indestructible.
7/1/2013 Creatures that enter the battlefield after Rootborn Defenses resolves will not gain indestructible.