Thats why its played in versions with four Caverns in the maindeck (but the version is bad, so you shouldnt add bad enablers only to justify playing it)
Whenever its controller casts an instant or sorcery, they flip a coin, copying that spell if they win the flip or returning that spell to their hand if they lose the flip
auto-includes like these are so popular that most players know exactly whats coming
The main difference between this and the previous version of disturb is that its very difficult to use Auras defensively, whereas playing flying blockers won many games in Innistrad: Midnight Hunt
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If you're swapping them in and out of a deck for playtesting, they'll behave the same as any other card in the stack