Populate. Creatures you control gain indestructible until end of turn. (To populate, create a token that's a copy of a creature token you control.)
Rootborn Defenses affects only creatures you control after populating at the time it resolves. The creature token you create will gain indestructible, but creatures you begin to control later in the turn will not.
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 Coursersâ€™ Accord does), you may choose to copy the token you just created, or you may choose to copy another creature token you control.
The new token doesnâ€™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.
The new creature token copies the characteristics of the original token as stated by the effect that put the original token onto the battlefield.
If you control no creature tokens when you populate, nothing will happen.
If you choose to copy a creature token thatâ€™s a copy of another creature, the new creature token will copy the characteristics of whatever the original token is copying.
Any â€œas [this creature] enters the battlefieldâ€ or â€œ[this creature] enters the battlefield withâ€ abilities of the new token will work.
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