For example, if you control Rin and Seri, Inseparabler as well as a permanent with "Each Dog you control enters with an additional +1/+1 counter on it" and you create a 1/1 Cat token, that Cat token will be a Dog Cat token and will enter with a +1/+1 counter on it, a woof, and a purr
You search up Plains equal to the difference in the number of lands, put one in play tapped, and put the rest into your hand
These are special themed 20-card booster packs, based on nearly 500 cards, several being reprints of cards from previous sets, with 121 possible packs available
Lets demonstrate this by taking a look at a fairly average Sealed deck I recently played that had 17 lands: Why is this deck playing 17 lands rather than, say, 16 lands (-1 Forest, +1 Arrogant Poet) or 18 lands (-1 Tenured Inkcaster, +1 Swamp)
Why does my JPG look sharp on screen but bad in print