I'm just going to put this one here because I have to.
Arena. My druid up against a Mage. I have a 4/5 and 2/1, she has a 3/3. I drop Big Ol' Tree and hit face.
Mage plays Faceless, on the Tree of course, then a secret, and hits nothing. OK, whatever. I pop the tree with my tree. And it turns out Duplicate was the secret! Oh. Well that's... not too shabby, actually. Two Trees in hand for 3 mana. Nice. I drop something small, a 2/x or something, and take out the 3/3.
At this point, I'm holding two Savage Roars.
Mage drops Tree. Savage Roar, and the 2/1s become 4/1s and kill the tree. I've just drawn an Ogre. Next turn, the mage's other tree falls to the SR'd Ogre. I win with a Swipe to the face a turn later.