What are the disadvantages of owning 2 credit cards?

I've been employed for the last 3 months and have over $15,000 and was wondering if 1 or 2 credit cards would be a good idea. I have an excellent credit score with no defaults recorded on it, I always pay my bills on time, and I am wanting to consolidate all my debts into one credit card, so I don't have... show more I've been employed for the last 3 months and have over $15,000 and was wondering if 1 or 2 credit cards would be a good idea. I have an excellent credit score with no defaults recorded on it, I always pay my bills on time, and I am wanting to consolidate all my debts into one credit card, so I don't have to memorize a lot of companies to pay.
Update: My current credit card company has an interest rate of 24.99% and the other one was a 5% interest rate.
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