For a long time, it was a legendary Vintage control card, and the mix of power plus scarcity is a big reason it built such a scary reputation, even if it ran up against mana burn when it was printed
This card is so complicated, that over the years players have made custom flowcharts to keep everything straight, which is fun for a Magic card that needs extra graphs
For example, if you exile a creature card, it can only be cast in your main phase when the stack is empty
Since Crobats evolution line is Colorless, you can use the Fire-type Energy to power up both Heatran and Arceus ex
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