Error getting the string between two patterns

I want to get a string between two patterns. The pattern is the first environment <p> </p> in an html file.

<p>Sorcery, 
          R (1)
          </p>
        <p class="ctext"><b>As an additional cost to cast Goblin Grenade, sacrifice a Goblin.<br><br>Goblin Grenade deals 5 damage to target creature or player.</b></p>


      <p><i>Don't underestimate the aerodynamic qualities of the common goblin.</i></p>
      <p>Illus. Kev Walker</p>

That environment is the first of the file so I discard everything matched until the <p> and I want to delete everything after the </p>.

name="goblin grenade"
wget -O- http://magiccards.info/query?q="$name" | grep -oP '<p>\K[^<]+'

I don't know why it doesn't work properly. I get

Sorcery, 
Illus. Kev Walker