Ment
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Yeah, Yashur, by the way, that's true. But in general, we often make healing effects only visible when necessary. And if that's the case, then the rule about not being able to cast a spell on yourself twice in a row seems reasonable. If not, then it's better not to have that rule at all.
And the rule prohibiting the use of direct damage spells on oneself in most cases is also reasonable.