Thunderscape Battlemage is a close second to Thornscape Battlemage for me. All creatures that get killed by FTK can be killed by Thornscape, and Thornscape kills Orbs, Webs, Millstones, Bridges and Idols. Tough to say that this is better than killing Opposition, Story Circle, Teferi's Moat, Fires or Burst in all cases, but it is a little less situational. So here goes:
Thornscape Battlemage
Thunderscape Battlemage
Meddling Mage
Hippo
Voice of All
Fleetfoot Panther
Shivan Wurm
FTK
Scuta
Sunscape Battlemage
for a Top 10.
Erik