Blue staples, sorted by "type". Types are commander-specific, and as follows:
Board Wipe - Cards which remove multiple permanents from the field
Bombs - Big Cards that Do Big Things
Card Advantage - Cards which allow you to gain/use more cards than your opponents
Lands - Hur de dur
Other - Cards in color which are useful but don't fit in other categories
Protection - Cards which prevent your permanents from removal
Ramp - Cards which get you more mana to spend
Targeted Removal - Cards which selectively remove permanents from the field
Tutors - Cards which let you seek your library for non-ramp cards
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