[6] While the other four sets have 60 cards, [7] the 2-Player Starter Set consists of 61 cards: two 30-card decks, each themed around a type, and an additional holofoil Machamp card
I think the card really ties this deck together, being absolutely ridiculous with 1) Sylvan Library, by milling cards you dont need and allowing an easy draw two) and 2) flashback cards, by letting you get value out of milled cards
Rosas Encouragement features a powerful energy acceleration effect (attaching multiple energy cards in a single turn under specific conditions)
They often live in hot places, too
Creatures in this set are relatively small, so as long as youre not dying in the air Zendikars Roil can lock up the ground and take over in a hurry
It doesn't copy whether that permanent is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, or so on