Given the capability of this transformation, Invasion of Amonkhet effectively changes your opponent's life total to four, which is an amazing deal for a three-mana card
A 5/4 flyer with flash for five mana is a solid deal all by itself, especially for decks looking to play mostly at instant speed and leave up mana during their opponent's turns
With Gargos, Vicious Watcher, you have a huge creature as your commander that makes all your other Hydras much easier to play
So, we picked different gameplay lanes for the three and different iconic dungeons from D&D that evoked those feelings and meshed the two together: A baseline dungeon, providing simple, clean value
Regardless of what you choose, any remaining exiled cards will be put into their owners' hands.