Proxy cards are not allowed generally but in certain conditions, it is allowed to include a proxy card in the deck of a player for a specific game by the judges making it an official proxy
Unless you can find a way to bounce that card back to your hand and re-cast the other side, you're stuck with whichever one you played first
Both achieve the same thing in making it more plausible for your characters to come out on top in challenges
Based on our rule that with an average CMC of 2.5, you need at least 25 lands in your deck, I would estimate that the Gr Devotion list would want around 29 lands to function optimally
Excellent for a remake of that Insect Queen However, it has multiple drawbacks such as being unable to self-ss, resistance loss if there are no other insects, continuous attacks have a cost, and token timing is slow
There are some tournament promotional arts that are more expensive than the base first-edition Blue-Eyes, but the dragon is the most expensive card that was available in booster packs, even if it was rare