The Space Family Goblinson has trample as long as you've rolled three or more dice this turn.
Whenever you roll a die, put a +1/+1 counter on The Space Family Goblinson.
Remember that if a die is rerolled, that counts only as a single roll. The original roll doesn’t count. Similarly, any die roll that’s ignored doesn’t count.
7 Oct 2022
If you roll more than one die at a time, however, that does count as multiple die rolls.