All this comes together to create some exceptionally valuable cards
Making Declaration in Stone an instant is certainly powerful, and strong enough that the exile was downgraded to destroy
On creature-heavy decks you should run fewer board wipes because you dont want to clear your own board too often (about 2-3 seem enough, unless they are one-sided where you can add more without hurting your own strategy) while on creature-light decks you need more (about 4-5 is a good number)
The art depicts a traditional looking teddy bear, a little dirty and grimy, but with multiple black eyes, like a spider, and some tiny white teeth lining the seam down its stomach
This card is an obvious reference to Mishras Workshop from Antiquities
Sets like Zendikar and Khans of Tarkir include fetch lands, while Ravnica blocks are essential for shock lands