The Goblin Warlock can only be summoned when a creature dies, via its Tragic Backstory ability naturally
There will be times you might want to be more cautious, but it's still mostly correct to attack in situations where you usually would
Its cute with Decayed zombies and Disturb creatures, but building your own 1.5-for 1 with a high possibility of failure isnt a strong starting point
You can, however, pay additional costs
I love this in the 99 of aggro decks like Boros Aggro, or goad brews that want to force attacks like the first one for triggers, or cast from exile triggers like Rakdos's Prosper, Tome-Bound or well, you can see the synergies, card flow and forced attacks this little boy can do and he drops before real counters are on line or are immune to them like Swan Song or Negate or An Offer You Can't Refuse
In such cases, you will be contacted to be relocated to the best available seating