When Infinite Reflection enters the battlefield, all your creatures become a copy of whatever it’s enchanting, and while it’s on the battlefield attached to a creature, each other creature that enters the battlefield under your control becomes a copy of that creature. If the enchanted creature or Infinite Reflection leaves the battlefield, the creatures that have become copies remain as copies. Notice that nothing on Infinite Reflection specifies a duration (e.g., “as long as Infinite Reflection is on the battlefield”), which means the copy effect will continue to apply to each creature until it leaves the battlefield or somehow becomes a copy of something else instead.

Of course, any new creatures will enter normally since Infinite Reflection is no longer around to change how they enter.

Today’s Rules Tip written by
Ronny Alvarado, Level 2 judge from Houston, TX