Dreadful Diplomat

Barter (When this creature enters the battlefield, you
may sacrifice a creature with lesser toughness than this
creature's toughness. If you do, put +1/+1 counters
equal to the sacrificed creature's power on this
creature.)
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The wants and ambitions of the heart sometimes
overpower the steady advise of the mind, in rare cases, causing the heart to foul and the mind to turn black.
--- Krirke, Scribe of Reason