first of all, Giant's aren't really that playable. But this is done better than most. Drop the Woodland Changeling for Changeling Titan, its much better, and championing is awesome cuz when someone slams you with Austere Command or Hallowed Burial, you've still got guys out to beat with.
Drop Runed Stalactite if you're running Giants. I mean, all your crits are Giants anyways, except the Stinkdrinker.
As for Recross the
Paths, most people prefer Farhaven Elf, because then YOU pick the land, and you have a creature anyways.
Gleeful Sabotage isn't really that good. I'd sideboard it, better to pack more removal.
Not sure I like Barkshell Blessing. It seems rather...small.
As for cards you can now add with all those dropped. You may want to run Feudkiller's Verdict if you can stretch your mana base to include White. Because with mana acceleration and Stinkdrinkers, you should be able to drop it. And its awesome when you do.
But at least pack Roughshod Mentor. Yeah, completely awesome.
Then of course, there's Hamletback Goliath. Which screams as loud as he can "UNMAKE! UNMAKE!" Anyways...
Welcome aboard! Hope you'll stick around. This is primarily a LotR TCG website, but we've got a few MtG players as well, though most play both games.