Venat, Heart of Hydaelyn gives you more card draw in your Legendary Matters decks, lower down on the curve
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On the other hand, legends in the main set can be designs built around the character independently of other cards to spark new archetypes of decks
Whenever one or more creatures or artifacts you control are put into the graveyard from the battlefield, draw a card
On top of this, there are a plethora of removal spells like Void Rend and Vindicate, that easily deal with your opponents' best threats
As a final note, I dont know anything about the Final Fantasy games myself, and I wont evaluate these cards based on how well they adapt characters, so I wont comment on the flavor at all