The backup mechanic is an enter the battlefield ability that allows a backup creature to put +1/+1 counters on another creature and then that creature also receives the backup creatures other abilities until the end of turn
Cleffa specifically addressed these issues and paved a way for decks to actually function and set up
From there, you are then still left with the option to cast the card as a Creature, which can be useful in a pinch
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3 Yuna, Hope Of Spira - $178 Full-Art Surge Foil It shouldn't be a surprise that the most valuable cards in Final Fantasy are also some of the best commanders, as plenty of people are going to want to build decks around their favorite characters
This will be especially problematic if you respond with any of the black instants that will return her to play immediately after she's destroyed, forcing your opponent to think carefully before they make another attempt