They represent Summons, creatures that are summoned to take part in battle, which are a common feature of the Final Fantasy series
Discover new glimmers, items, and powers in these booster packs
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Given that summons frequently end up in the graveyard without trying too hard, playing Yuna and immediately getting one back for free sounds incredible
In order to maximize Zidane, the goal is to have a bunch of ways in your deck for your opponents to take your stuff
One mythic can flood you with mana, bury your opponent in card advantage, and threaten to end the game on the same turn