What we need for bounce to be great is a powerful discard spell. That way you pretty much have destroyed the creature, though it wound up costing you 2 cards. But the cost would be far less, and has much more possibilities. And Jyou, I actually preffer bouncing Gigaberos and watching them cringe.

GB + SG = Pain and total not coolness
Plus, if you used SG, you could use Ghost Touch about 2-3 times and pretty much stab for a total of 6-8 mana.

bounce- less mana for you, more mana for them- can't lose.