Released in the MTG set Outlaws of Thunder Junction earlier this year, High Noon is a big upgrade on older cards like Rule of Law
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Total Unique Magic Cards Lets start with the easiest part of this to answer first
So, if you have four creatures in play (counting Moonshaker itself), all those creatures will get +4/+4
This desire to help humans survive is reflected in his design
Though this is a great combo, if you just have Azusa out it does mean you're never going to increase your mana pool