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And in Commander, this is a useful tool if you have an ally at the table

Collectors admire both its artistic creativity and rarity

Both you and the CPU's decks will have the same cards in them

At only 2 mana to activate, Scrying Sheets makes for the perfect mana-sink to save for an opponent's endstep, right before you untap to reap the benefits of your newly-drawn Snow card

You can gain card advantage through favorable interactions with your opponent's cards

Efficiency can be determined simply by the reward you receive at certain mana costs (Counterspell and Cancel do the same thing, but Counterspell costs less), the total payoff you receive from a single card (Hull Breach and Decimate are both good cards, but Decimate usually covers much more ground), or the payoff you receive in conjunction with other cards (Anointed Procession makes other token production cards completely absurd if unchecked, which is usually better than adding one more card that simply makes tokens like Spectral Procession in a token strategy)