Meren typically has a large target on it as soon as you cast it, so make sure you are playing it into a board thats ready to either get you a bunch of experience counters right away or you have some other way to protect it
Gourmands Talent It only comes on level 2, but Gourmand's Talent can give you a free 3/3 creature each turn if you gain life
The entire sale is a pre-order, which according to Wizards of the Coast means "all product will ship at a later date once inventory is available." And if you think this is weird, wait until you see the My Little Ponies!
Jurassic World cards can be found in 1 out of every 12 Set Boosters and one in each Collector Booster
You can expect for it to gain 4 life and make 2 1/1s against any aggro deck which should be enough to stabilize the game and regain your footing
I probably play more enters-the-battlefield tapped lands than most folks, since my local environment with the other RC members is pretty slow, so I see how Tiller Engine might be something that I get a little extra mileage from