Okay, let me share one awesome kaboom plan:
Bluesberry
The card might seem weak at first glance it straight up two cards for one. So it is a great card for control decks that are looking for the card advantage.
In addition to that, it is direct damage so it is pretty much the perfect 5 cost card for aggro decks as they often need one last strike on the zombie hero once the opponent set up a wall.
In addition to that, zombies often skip turn five for kill cards such as locust or cake bomb and throwing the bluesberry in is sure a great trade.
The 2 damage can also be directed into any lane so it can target amphibious zombies so that the plant hero may not need to bring amphibious plants.
Gargautuars also come on turn five too so a bluesberry can deal two direct damage and combine it with the three damage to kill the gargantuar.
Finally, it can take on two lanes at once! Kill one and block the other, providing great defenses. It can go on the offensive too by placing itself on an empty land and open a lane for another plant to strike the zombie hero.