You ignore the timing restrictions normally placed on sorceries, which is cool, but this feels like a very underwhelming ability
The insect costs three to cast and has a baseline stat of 2/2
While I wouldn't be surprised to see Slivers get there in Historic eventually, we probably need another Sliver set or two to make it happen (although they do rank a tier above Squirrels because at least there are enough Slivers to make a functional deck)
We usually flesh these documents out in meetings with our creative team, but for Counter Blitz, I went into the meeting with that document almost finished
Lets say you have 26 lands in your deck, and youve played half of those and have seven other cards not in your deck (either in hand or in play), youve basically moved from 43,33% to 32,5% of lands in your deck
In the lead up to the release, the Enchanted cards were previewed on various websites around the net and we have the full list here