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Power: How powerful is the card at what its trying to do
Many collectors use them in conjunction with penny sleeves and consider them a reliable mid tier choice: better than generic toploaders, but more affordable than ultra-premium lines
Creature swarms still work, but these decks tend to run Anger of the Gods
The Lieutenants protection from multicolored also protects him from a lot of removal in the format, like Assassins Trophy, Anguished Unmaking, and Terminate
One-touch holders come in specific point thicknesses (35pt, 55pt, 75pt, etc.)