For the low, low cost of eight mana (thats not a low cost), you can basically win most games on the spot
Swan Song, Pact of Negation, Flusterstorm, Fierce Guardianship, etc., can all be super useful
Only an Assassin needs to deal combat damage to be able to cast for the two black mana freerunning cost, meaning Ezio can sit back on the battlefield to keep himself safe in combat while still taking advantage of his passive ability
It just does all the strong things while replacing itself at a minimum
Tidus, Yuna's Guardian: Cheerful and carefree, Tidus was an ace blitzball player in the city of Zanarkand
The 16-pocket design enables you to quickly flip through and find the specific card you are looking for, eliminating the hassle of flipping through multiple pages