The point about having life drain still stands, even if you remove trampling from the equation.
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				I have absolutely no problems with SCs as they currently stand, as they are vital to prevent the game from devolving into a zerg rush of "whoever has the most troops wins".  
			
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 I'd say that SCs are not the only thing to prevent such a problem.  Area effect spells, battle field summons, trample, artillary spells, etc. prevent this as well.