If you are designing custom game piecessuch as the highly popular custom Food tokens for the MTG Marvel release you should use the standard MTG dimensions of 63mm x 88mm (2.5" x 3.5") and design at 300 DPI
One more way to reduce the overall strength of your deck is to opt instead for more creatures and effects that have to survive a rotation around the table to begin accruing you value
9 Play Boosters for playing with friends or to open just for fun
Yes, there are methods around this by, say, playing Duress turn one and then hitting them with a Cabal turn two to clean up what you couldnt get before
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At the beginning of your end step, create a 5/5 black Demon creature token with flying, then mill two cards