There are a couple ways to approach Unicorn in the single core environment. One is to try to fill the holes by selecting an influence splash that gets you some quality effects you are lacking in your clan card suite. The other is to just try to get as many combo pieces into the deck as you can and hope to do something amazing.
Normally I would recommend playing the cards that are consistent and rely on good decisions. In the case of the Unicorn in the single core format I lean towards hoping to combo off. I think Unicorn will be rather formidable in the normal constructed environment, but single core is rather difficult for them to play up to the same level as everyone else.