Once it has converted due to that triggered ability, the rest of the abilities will resolve and do nothing
With Hakbal of the Surging Soul, the damage is usually done even if it dies, leaving behind a bunch of extra mana and +1/+1 counters for your explorative merfolk army
(If this creature isn't monstrous, put ten +1/+1 counters on it and it becomes monstrous.) When Grim Giganotosaurus becomes monstrous, destroy all artifacts and creatures other than Grim Giganotosaurus
The characters can end up in your discard pile either through being banished from the board or by you discarding them from your hand
You need a high concentration of elves, but the mana production comes at a great rate
They help end the game through attacking and they also stop the opponent from executing their own game plan by removing their creatures from the battlefield