If you cast a spell for which mana may be spent as though it were mana of any color, you may cast it for Leyline of Mutation's second ability's alternative cost and still spend mana as though it were mana of any color
You are setting up an opponents creature for death, and then you can let someone else kill it to get cards and life, in a nice flurry of card advantage akin to a Veteran Explorer or somesuch
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Though it does have some similarities to red/green and its Powerstone-focused playstyle, green/blue is entirely focused on just throwing out as many as possible, making massive amounts of mana, and using it to cast even bigger creatures
That means that for once, protection from blue or monocolored isnt enough