Let Mega Venusaur ex remain active and force your opponent to deal with its constant presence
Weakness: Fire (x2) Resistance: Grass (-30) Retreat: 2 #126 Applin - Dragon - HP40 Basic Pokemon [C] Find a Friend: Search your deck for a Pokmon, reveal it, and put it into your hand
On the other hand, we played against Mono-Black Auras, which was overloaded with Dead Weights and Mire's Grasps, and it felt like we had zero chance of winning (in part because of the amount of removal our opponent had and in part because enchantments get around many of our sideboard cards, like Miscast and Seasoned Hallowblade)
The timing is something we don't know, but the most logical thing would be that they arrive sooner rather than later and that, together with them, all dragon-type cards are updated.
The progress graph shows how the students mastery score has changed over time