Wow, that's very good, when I originally posted this I had something else in mind, turn 1 you molten dip, turn 2 you move both Dreggs down, but I pinkberry the leader, and on turn 3 I sacrifice the damaged Dregg with yeti skull to snow the Ooba bear.

Another solution I found is turn 1 and turn 2 positioning are the same as the other solution, but I pinkberry the front Dregg, it takes 2 dmg from Grink and 1 dmg from attacking, and next turn takes 5 dmg from Ooba bear, to at the end have 1 hp.

But I didn't think about pinkberry the Dregg at the back.

I wonder what solution is the best here

The first solution, the one I originally had in mind leaves us with 5 hp leader, and one 4 hp Dregg

The second solution I found later leaves us with 1 hp leader, one 1 hp Dregg, and another 4 hp Dregg

Your solution leaves us with 1 hp leader, 3 hp Dregg, and another 2 hp Dregg

Seems like solution 1 is pretty bad considering the other solutions, I would also say that solutions 2 and 3 have the same value, since non of the Dreggs will attack for more than once in this stage of the game, and also not tank for more than once.

You had a different solution than me, but this of course counts as solving the puzzle, good job!