just feed it through a sac outlet or put it on blocking duty
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Few cards have ever used unattach in rules text, and none ever in this way
The card art is what boosts Pacifism to its place here, even if it isn't the most useful card, as the striking contrast in colors is more important
If you take your 60-card deck and put each spell in a pile based on how much mana it costs, how many cards are in each pile