Summon: Primal Odin My biggest concern for the Summons is that they are all quite expensive, Primal Odin included, and being not only creatures, but enchantments as well, makes them seem extremely easy to get rid of
Its second-best feature is to double the triggers from the doctors abilities, so The Tenth Doctor can get plenty of Allons-y triggers, while The Ninth Doctor can get an extra upkeep, and so on
And if they choose to take a bunch of damage and let you draw three cards, thats a fantastic advantage in its own right
An excellent addition to blacks removal suite
You also have Legend cards, with players limited to just a single Legend per deck, and Fusion Summons must be performed with cards on the field, not in the hand