That seems like not enough
Just so you have a reminder who the players are in this set
They all think that keeping mum, that shredding their documents, that tossing knowledge down trash chutes and into rat-infested sewers is good enough to cover their trails
There are a total of 18 Enchanted Cards in Shimmering Skies, which is the same amount as Ursula's Return and Into The Inklands
Trample and haste are the prime keyword abilities for this aggro strategy, whether with creatures who have these abilities or the ones who can throw them around your board, like Mina and Denn, Wildborn, Cactusfolk Sureshot and Fires of Yavimaya
Doing any or all of these at instant speed can allow you to set up game-ending turns out of seemingly nowhere, and its all tacked onto a counterspell