Of course it's possible, it's just not generally a good idea for a mono deck.
is an /awful/ card. All he can do is shut down abilities, which might seem ok, but his 5 power means he cannot wall at all and even if he shuts down a nasty ability the damage gets through for a very tiny pill cost.
The real joke is this is coupled with 2 damage, which means that investing in him as a wall wouldn't pay off much even if you did win.
Of course, your deck will be playable, but if you can afford Smokey Cr
you'll be able to make it /much/ more effective. A 3* with +3 pillz and 7 power is a ridiculously powerful mid range card, even with low damage.
In half deck situations you can replace Smokey with Tyd
without loosing too much potential, but in a mono I wouldn't recommend going without him for too long.