If you tee it up with a card like Not Dead After All or Kayas Ghostform, Ancient Adamantoise will return to the battlefield before it can be exiled by its death trigger
There are some Blitzball-themed cards that can help you achieve this goal, both of which work well with a version of Tidus in Magic
The hexproof enabler makes it worth running, most of the time
In the main set, Yuna, Hope of Spira has mechanics geared toward using the various Summon enchantment creatures across the set, including Summon: Bahamut
Collector booster from Innistrad: Midnight Hunt
Card draw and hand attack are always good, so whatever Grixis strategy youre running, theres a good chance he can make it better