Methods of altering spell costs are deeply ingrained in the game, with examples ranging from Force of Will to mechanics like Affinity, Improvise, and Delve
Theres more than one way to randomise your deck, but anytime you shuffle, you must ensure that the deck is completely random (or as close as reasonably possible)
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Both should be good either way, but its a close struggle like Stab vs
Some limit the pool of cards in the format to provide a different kind of gameplay, like Artisan or Pauper EDH
Lands with cycling have been around for over 20 years, lands that enter the battlefield tapped and tap for 3 colors of mana have been around for over 10, and nonbasic lands with basic land types have been around since Alpha