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Sensei's Divining Top Another artifact that got itself banned from Modern and Legacy, Sensei's Divining Top goes infinite with just about anything that has a Magic logo on its back

This is a rarely used mechanic because it isn't super popular and has playability issues according to Mark Rosewater

If it has no digivolution cards, or becomes a level 3 Digimon, you can't trash any more cards.) [On Deletion] You may play 1 black level 4 or lower card with [Hybrid] in its traits from your hand without paying its memory cost

and two Akira posters ($2,032 and $2,286, respectively)

Loot has an upkeep trigger to exile can cast that turn cards from your library equal all nonland card types I control, but not themself