New Plant card so powerful it's like a boss

*plays Rocket Science/Cut Down to Size/Locust Swarm*

Boss DEFEATED (⌐■_■)

I get the main idea. You want a plant that has ALL the characteristics of the game.

But you know how you would do a REAL super plant boss?

Make a 10 suns something/something plant with strikethrough and make it untargetable.

Therefore, you can't just simply kill it by using tricks, you can't NEITHER reduce it's attack with something like Nibble/Landscaper.

And because it's a strikethrough, you can't simply put a 1/1 to block it's attack. You need to slaughter a nice amount of zombies in order to finally take it down.

(Only con, Deadly zombies)

Original Post has the balance (mostly) required.

azombioso's suggestion is widly overpowered

Really? I don't think so.

It may be a 3/6 or something like that. 

Laser Bean is a 4/6 with strikethrough that costs 6 suns. I think that for 4 more suns having the "untargetable" characteristic is fair enough.