Part of keeping it out of a single player's control was allowing all players to influence it
Cards from the Assassins Creed set benefit this commander immensely, but cards in the original Ixalan or The Lost Caverns of Ixalan also support this strategy, and you can find other good vehicles in sets like Kaladesh
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Regardless, its a pretty safe long-term investment
After all, no new cards will be added to the list, so the reserved list can remain irrelevant
Upon being cast this spell's controller chooses a creature type, destroying all creatures save for those of the chosen type