MacArthur's Commendation

Enchant creature

When MacArthur's Commendation enters, put a +1/+1 counter on enchanted creature.
Whenever enchanted creature attacks, you may sacrifice MacArthur's Commendation. If you do,
put target creature on top of its owner's library.
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"Duty, honour, country. No greater reward can be earned."—General Douglas MacArthur