Pleased to see another playable Un- card. I've had Blast from the Past and City of Ass in my cube forever. Topsy Turvy might be stronger than both of them! Can't believe nobody noticed it before.
Edric might edge out Mystic Snake for some in a very tight UG section but Simic Sky Swallower should never be cut. SSS is a very reliable and efficient win condition. It also supports ramp, reanimator, NO, and GSZ. Flying and trample = gdlk.
If the prices at your LGS are too expensive then tell the owner/manager that your business will have to move to websites like eBay and online vendors because his prices are not competitive.
a) All-in on hammer plan: Make golems every turn starting on turn 4. This requires lots of resources.
b) Use hammer to give haste to 4-drop and then make golems.
There problem is that lots of red 4 drops already have haste. =/
I've had Mental Misstep in my powered 360 since it came out without ever being disappointed by it.
Nothing else you can do about it.
Great job, wotc.