While the "ease of flipping" category is, in large part, a product of the number of defense counters on the battle (battles range from three to seven defense counters, and a battle with three defense counters will be much easier to flip than one with seven), it also takes other factors into consideration, like whether the battle makes creatures (if so, we can use them to help defeat the battle, making it easier to flip) or whether the battle acts as removal (which can get a blocker out of the way, making it easier to attack and defeat the battle)
You also may encounter special serialized Doctor cards in Collector Boosters
This deck plays 24 maindeck lesson cards, and lesson synergies
An effect which says copy target spell puts that copy directly onto the stack, so it was neither cast nor played a technicality which could matter a lot for some errant spellslingers
Standard Expansion Guarantees For a typical main expansion box (30 packs), you can expect: That means every single box gives you at least one premium pull worth keeping or trading