Let's say I have a Grim Guardian on the field and a number of other creatures, for the sake of this example let's say 4 others. If I enchant the Guardian with an Infinite Reflection, will the creatures become copies of Grim Guardian in time for each of them to deal the 1 damage for the Reflection enchantment entering the field, leading to a total of 5 damage when the Reflection enters?
Also, just to make 100% sure, each other creature would ETB as a Guardian, and so the next creature would cause 6 damage to be dealt (1 for itself and 5x 1 from each if the others alre as dy there), the one after that would deal 7, etc, correct?
No. Infinite Reflection has itself an ETB trigger. Since it has enter the battlefield, trigger, and resolve its ability to turn your other creatures into Guardians, the time for those to trigger has long since past. They have to be Guardians already when the enchantment enters, so even before its own triggr can make it to the stack, let alone resolve.
Once the Reflection is attached, every nontoken creature of yours is a Guardian and new ones enter as Guardians triggering themselves and all others. This will cause a number of triggers equal to the number of Guardians already there plus the newcomer, and make all opponents lose 1 life per trigger. Note, that this is not damage, it's direct loss of life, which can't be prevented by damage prevention. Damage to a player usually causes loss of life, but may cause other things as well or instead, like poison counters.
Also, just to make 100% sure, each other creature would ETB as a Guardian, and so the next creature would cause 6 damage to be dealt (1 for itself and 5x 1 from each if the others alre as dy there), the one after that would deal 7, etc, correct?
Once the Reflection is attached, every nontoken creature of yours is a Guardian and new ones enter as Guardians triggering themselves and all others. This will cause a number of triggers equal to the number of Guardians already there plus the newcomer, and make all opponents lose 1 life per trigger. Note, that this is not damage, it's direct loss of life, which can't be prevented by damage prevention. Damage to a player usually causes loss of life, but may cause other things as well or instead, like poison counters.
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