@Francisco Perez
My first thought is "is it true?, can you make good on your promises?" A quick glance at your profile shows that you're new to real estate (like me). And if you're also like me, you don't have a whole lot of cash. So are you able to buy that $250,000 home all cash? Maybe your market is $30k and you have that laying around (on top of money for repairs and an emergency fund for Murphy), but I don't.
People don't like false advertising. It may be what the template cards you can find online say, but those are intended for companies or individuals who can go in all cash and close in 7 days. If you can do that, great, ignore my post.
As far as the rest of it goes. Maybe someone else out there can correct me if I'm wrong, but the standard "we buy houses" tends to be what they talk about on the podcasts and they're saying it works. So my motto is don't fix what isn't broken. Additionally, I think a picture or icon on the card would help. Even if it's just dollar signs.
You've got about 3 seconds to capture attention when someone pulls that out of the mailbox. If I see a pizza on the card, I know it's from Domino's or wherever. I might be interested in what they have to offer me. Plain text like that would probably get tossed in the trash without me really looking at it. My apartment complex has a trash can next to the mail boxes I utilize quite frequently. The ads I keep catch my eye (to then get tossed in my personal trash after further consideration, unless I really like it then it sits on my counter for a week). That's just me personally, but I'm sure there's others like me.