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This spell can't be countered.
Creature spells you control can't be countered.
One day someone must explain me this "dual" creature Type Cat / Snake...
It remind me some of the latest warlord CCG cards created that was dual faction if you know as well this really nice CCG games.
For the little story some Wizards ideas seems strangly taken from it but that's a personal thoughts :)))
So let's go for this Serpent's cat rules and analyse.
First it cost 3 mana for a 4/3 who's really a very very ... Good mana calculs "balance power".
The second advantage it's a cat and a snake, so shake a little your brain it will normaly gives you some ideas :))))
But the best is that he canno't be countered when he comes in play, as for ddition your others creatures as well when they are launched ... (means as well... Flash creature if you follow me...).
Think this one will be a big classic for the forthcoming years :)