nessa pokemon card full art - 118/100 (118/100) RarityUltra Rare Card TypeTrainer FormSupporter Nessa - 157/185 (Reverse Foil)

Jawbone Duelist Toxic and double strike is a combo of abilities begging you to be creative

RLS Legacy - Solar Galleon - Enchanted Rare Lorcana Into The Inklands has introduced Location cards and they didn't waste any time introducing them as Enchanted cards

After you move your venture marker into the last room of a dungeon and that room's ability resolves (or otherwise leaves the stack), the dungeon leaves the game and you have now completed it

As for the Mythic Invitational itself, I would call the event a modest success

You'll want to increase your Dragon count to ensure that happens with each foe, and note that this is just once per attack no matter how many attack