Noncombat damage from those creatures is prevented only if they're still attacking at the time that damage would be dealt or, if the creature has left the battlefield by then, if it was an attacking creature at the time it left
This seems like another example of too many hoops for too little benefit
You have Simian Spirit Guide for a free , true, but thats not a guarantee
Designer Notes: Because Nicol Bolas is expensive to flip over, this deck includes a lot of extra mana effects to help out
If you have more Sahagins and Dragoons Wyverns, your deck will tend towards aggression, and with more removal and card draw, it will lean towards control
Being able to target your own permanents with harmless or inane spells to start creating copies of them is just such an absurdly fun strategy