The Esper decks all over Worlds would definitely play 1-2 of these
I should point out that theres another card for Terra in the main Final Fantasy set which places much more emphasis on this aspect of her character, actually transforming into a Saga Creature like the other summon/esper cards and having special synergy with them
I personally am a big fan of loose (raw) cards
There is also a cycle of legendary, rare creatures, with powerful effects that can turn the course of a game: Sephara, Skys Blade (White), Atemis, All-Seeing (Blue), Vilis, Broker of Blood (Black), Drakuseth, Maw of Flames (Red), Gargos, Vicious Watcher (Green)
You don't have to choose a card to copy
The main difference between these formats is in their 'rotation' - which sets' cards you can legally use in decks - and which powerful cards are banned