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Many of these cards especially the best colorless creatures MTG like Wurmcoil Engine also have a triggered ability that goes off when they enter the field or when a certain event happens, which can add layers of strategy to your turns

Narset of the Ancient Way Narset of the Ancient Way might not be the strongest planeswalker, but its loot ability can be useful

Flawless service all around

This includes their traps and their continuous spell, but not their field spell, and of course all of their monsters

The Fairy type was retired in 2020 for new sets, though older cards retain the type