All taplands = bad, that's what there is to say.
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Is draining whelk your one and only win condition? What's the typical game like? Counter counter counter draining whelk? First of all, you won't be able to counter every threat to buy time until draining whelk comes out. Also, fast decks will murder your deck. Guile offers great offense, as it can't be easily blocked, and it goes extremely well with counterspells, as you can steal the spells and use them to protect yourself.
replace the 4 burnwillows for stomping grounds. you dont want your opponent gaining life every time you tap it. use the perishable shock creatures like groundbreaker along with wild pair.
Put in 3 more glorious anthem, take out the 4 surge of thoughtweft, take out the kinsbaile skirmishers, and put in some field marshalls. But, good job.
How do you expect to play the Groundbreakers? You definitely need more dual land type cards. 9 Forests and 4 Karplusan Forests aren't gonna hold up the triple GGG cost. Also, use spark elementals, giant solifuges, ball lightnings if you dare, and blistering firecat, which includes a double RR cost, which is still lighter than GGG.
nonono u've got this all wrong. u really need a shirei, shizo's caretaker and a pardic miner. that's all. 2 cards. if u get those 2 out, then your opponent can never play lands again. THEN you start working on the lands that they have.
you need cloud key and 2 Sensei's Diving Tops to play them infinetely. Then you can deck them with brain freeze and its storm ability in one turn.
curiousiyl is only 1 blue and it's the same thing as ophinian eye.
Put in dual lands and Ball Lightnings/Groundbreakers for even faster kills. And take out Grizzly Bears! They are slow and don't do anything significant. If you really want a plain ol' 2/2 for 2, then replace them with Ashcoat Bears. They're the same thing, except Ashcoat Bears have flash. Otherwise, good job and look at my Suicidal Aggro Burn deck for slightly similar ideas for quick kills.
since when were sliver decks beatable? add some of the old slivers in-they're better.
Replace Ophinian Eye with Curiosity. It's the same thing and its cheaper.
Use Remand! One of the best counterspells for 2! And it's blue!
This deck seems like it could bring the hurt pretty well. However, try adding a Thorn Elemental, as it has the same effects as Rhox. You could also add a Rofellos, as he can add one G to your mana pool for each forest you control by simply playing one G and tapping him. Try adding Moldervine Cloak, as it is highly efficient, and a rancor, which is even more efficient and keeps coming back. But overall, this theme is really solid.