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All of these are very much versions you can find easily, and for very cheap if your deck wants a Phyrexian Arena

A slayer gets by on wits and reflexes. Higa, slayer-captain of Gatstaf Illustrated by Steve Prescott Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp

Unpronounceable gods and unknowable horrors lurk just an inch beyond reality, and everyone keeps trying to invite them in

Add to that the fact that white is the colour most tied to blinking, and you have an Angel you can flicker every turn to get more and more low-cost creatures out into play

Other cards, like Koffing from Mythical Island , are examples of more niche tutors

And also Gates decks