Minimum requirement of 1000 packs
Either will work out just fine and the cost difference is negligible
To determine the amount of life the target opponent loses from Rapacious Guest's last ability, use Rapacious Guest's power as it last existed on the battlefield, not its power in the graveyard
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)
Dredge 3 (If you would draw a card, you may mill three cards instead
For some collectibles to retain value, they need to be in their original packaging