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You can also cast an instant spell in response to an effect already on the stack

Card Set(s) -THE TIME OF BATTLE- [OP-16] CARD VIEW OP16-082 | SR | CHARACTER Kin'emon Attribute Slash Block icon 5 Type Land of Wano/The Akazaya Nine Effect This Character gains +3 cost

This means that your opponent has the opportunity to respond to the trigger

I play a lot of Green decks, some of that is for the ramp, but just as big is making sure you hit every land drop and Environmental Scientist is very good on that front

Occasionally though, when you can convince two of your three opponents that its in their best interest, it instead serves as a four-mana Time Walk