If an attacking creature has a "Whenever this creature attacks" ability, that ability is put on the stack first, then Kazuul's ability is put on the stack
Its not actually bad for you, but might be something that would deter newer players from using this
Having these creatures die and not having anything in the graveyard to reanimate hurts quite a bit, so in the early game, it is sometimes a good idea to try to discard a cheap creature like Evolved Sleeper or Faerie Vandal to Tainted Indulgence or Evangel of Synthesis so we'll have something in our graveyard to reanimate once our Puppeteers and Anointers start hitting the battlefield
Four mana to deal two damage split up isnt a great rate, but when its good its great
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Nevertheless, it's always good to see that constructed decks still feature powerful common cards, as it points to healthy conditions for the game