The absence of Trainer abilities in-game contributes toward the appeal of training up teams of Pokmon, and optimizing their movesets for the challenges offered by Gym Leaders and Trainers
This means it is active the turn Gonti hits the board, and you can send creatures in to reap the rewards right away
but it will take me a while to do it, so don't count on a release anytime soon
Convoke means you can often cast this at a discount, and even it always cost 4, it'd be playable
These instructions will apply to any version of the game you are playing, though the screen shots are captured from the PC version
Very few goblins, basically just Seige Gang, offer enough impact on the board to be a potent tempo use of Nightmare