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If the enchanted creature gains flying, Trapped in the Tower is put into your graveyard as a state-based action

The reminder text for dash states that you can cast this spell for its dash cost, which is relatively self-explanatory

In FF7 , Jenova is described as a calamity that fell from the sky long ago. Shes not a mutant herself but is instead an alien with a mutable genetic structure, absorbing the traits of beings she encounters while also inserting her own DNA into them, transforming them into mutants that eventually can turn into monsters

The same is true for counters that change its power or toughness (such as +1/+1 counters)