It was first seen in Eldrazi Ramp back when Rise of the Eldrazi was Standard legal, and this kind of effect is extremely powerful in chaining multiple spells together
Subsequently, it may not surprise you when I mention that a bread and butter combo for KCI decks during this period involved executing a combo in the middle of casting a spell
Thats odd
There are other even smaller cards that do things like this with extra conditions, like Edgewall Innkeeper

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