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So I guess Ill have to cover that in another article

Also once per turn, its powerful Pendulum Effect protects Rainbow Dragon, Rainbow Dark Dragon (as monsters) and Crystal Beast cards from being destroyed effects

Thats not too bad of an effect, but you need to have something good to bring back, make sure youre not exiling so many cards as to turn off other delirium effects, and then make sure youre not exiling something youd want to bring back later

Some of the features include gym leaders with weaker Pokmon, ...

There are definitely matchups in which Teferi, Time Raveler doesnt have a big board impact, but when it does, its often absolutely game crushing