Pensamentos de Despedida
Destroy target creature. You draw X cards and you lose X life, where X is the number of counters on that creature.
Parting Thoughts can target a creature without any counters on it. You’ll lose no life and draw no cards.
If a creature has +1/+1 counters and -1/-1 counters on it, state-based actions remove the same number of each so that it has only one of those kinds of counters on it. There won’t be any counters of the other kind for Parting Thoughts to count.