does mtg arena have all cards I've seen one Spiderman card, and it's already my set of the year MTG Arena Reprint and Card

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And what do you have in your arsenal to check or nullify those threats

In order to activate the ability must I have some other means of looking through my library

Some cards are placed face down and can be triggered either at will or when certain conditions are met in the game

Only non-Aura permanent cards exiled by either of Karn's first two abilities will remain in exile when the game restarts

Cards like Doubling Cube also demonstrate how this deviation from usual Magic arithmetic allows for unique and interesting build-arounds its not all just brute force and big numbers getting bigger