Tempting offer — Put a +1/+1 counter on each creature you control. Each opponent may put a +1/+1 counter on each creature they control. For each opponent who does, put a +1/+1 counter on each creature you control.
Your opponents decide in turn order whether or not they accept the offer, starting with the opponent on your left. Each opponent will know the decisions of previous opponents in turn order when making their decision.
After each opponent has decided, the effect happens simultaneously for each one who accepted the offer. Then, the effect happens again for you a number of times equal to the number of opponents who accepted.