One anniversary poem for a card is, "Another year to create precious memories together. Another year to discover new things to enjoy about each other. Another year to build a life rich in love and laughter. Another year to strengthen a marriage that defines forever. Happy Anniversary." Additional poems can be found at websites such as Poemsource.com.
Those wanting a more religious verse may like this one: "Dear Lord, please bless this husband and wife with a comfortable home and a happy life. We pray for love that never ends, contentment, joy and lots of friends. And when each pleasant day is through, we pray they'll turn their hearts to you."
Husbands and wives may enjoy this poem for their significant other: "Happily ever after is really a myth. It depends on whom you're happily ever after with. If I had to do it over, I suppose that it is true. I'd still want to happily ever after with you."
This humorous poem works for a 10-year anniversary: "Happy anniversary. It's been 10 years, you've made it! You've stuck it out. You held on tight. You're not the least bit jaded. Happy anniversary. You're now at number 10. So stick it out for 10 more years and I'll send a poem again."
The following works as a more general greeting if none of the others work: "Your anniversary is a time for sharing your affection. It's obvious the two of you have quite a deep connection. We send glad congratulations and heartfelt wishes, too. For joyous happiness and love in everything you do."