The future value of cards also factors into this

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I returned to Magic after graduating college right as the Alara block released and its still probably my favorite block ever
One of the main considerations with a card like Permission Denied is that it can be difficult to hold up the necessary mana to cast it while still advancing your board
Specifically, keep an eye on Slivdrazi Monstrosity, Mirrored Lotus, any of the Planeswalkers, Puresteel Angel, and Sliv-Mizzet, Hivemind