Here's what we think is going to happen this year, based on previous events
If youre playing Lorcana competitively, youll need to build your own deck, and we have the basic details on how to do so in our how to play Disney Lorcana guide
Of those three abilities, the first is best for draft if the player has enough Adventure cards and they don't mind delaying an Adventure creature finally entering the battlefield after two Adventures
You draw two cards and you lose 2 life
The mill ultimate is neat but doesnt really synergize with the rest of the card, though cards like Sphinxs Tutelage and Psychic Corrosion can turn the draw from its front side (and lets be honest, youre playing blue so you will draw cards) into some library damage
Like most Pokmon cards, the value of Mega Gengar ex depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Ascended Heroes)