Some people make a career out of market manipulation, creating mathematical models to analyze the growth of cards' worth, and predict the market value of both individual cards, and entire sets of cards
For a time, it got to the point where people were calling for its ban
Once its on the field, every spell you cast becomes uncounterable too, which can completely shut down control decks
With Standard rotation coming very soon and the next announcement scheduled for November, Final Fantasy cards are generally positioned as they were planned by WoTC, much to my contentment
This keeps them on the back-foot and dancing to your tune until you're ready to deploy characters with 'Evasive' (meaning they can't be challenged unless the other card has Evasive too)
(It can't be the target of spells or abilities your opponents control