Ah, I see, so it fits criteria #3, not #2, but it is so good in that criteria, so GM actually deserves extra point in that criteria to become a superb tank.
Criteria #1 is kinda interesting for me.
What forces players to switch from rainbow attack team to color stack?
The fear that they cannot kill the tank before it fires, and when it fires, it’s kinda instant raid loss.
Usual equation for the “tankiness” of a character you can find here on forums is sum of defence and health.
I’d propose a different formula here for tankiness, that actually takes damage formula into account.
If you don’t like math, don’t read below:
So, tile damage for one tile is TD = 100 * (Attack / Defence)^1.35.
Raid defence team has defence bonus of 20%. Take it into account.
We would like to kill the tank before they fire, so we need at minimum 6-7 tiles for extra fast, 7-8 for fast etc. So the damage should be more than hero’s health.
If we make an equation, where on left side is hero’s health (H), and on the right side is the tile damage times number of tiles (N) needed to trigger the special of the hero
H < TD * N = 100 * (A/D/1.2)^1.35 * N * 2 (factor for strong color)
Solve it for A, and we get minimum attack value needed to kill the tank with strong color before they fire:
A = D * 1.2 * (H/(200 * N)) ^ 0.74
Let’s call this “passive tankiness” (PT). I’m not taking troops attack/defence/health bonus into account here, leaving it as an exercise for the reader,
So, for example, GM without mana troops has PT= 832. With troops, GM has PT=933
Guin has 697 and 753 respectively.
Onatel has 766 and 828.
So, if you want to kill GM before he fires even once, with strong color, you need to have your strong color base attack to be more than his passive tankiness (basically, to have more than 933 attack, which is impossible without color stacking).
With Guin, it is quite possible to get lucky and kill her with 10 dark tiles in a row if you have 1 dark hero with 750 base attack. If you have 2 dark heroes with 750 base attack, you can kill her with 5 dark tiles. If you have 3 color stacked heroes, you’ll need 4 dark tiles. If you have 4 color stacked heroes, you can kill her with 3 dark tiles etc.
The raw passive tankiness can be used as a rule of the thumb for color stacking. It can be further altered by taking into account how many times the tank can fire their special before it’s game over for you.
For example, if you can survive GM firing two times and still win, you can halve the PT rank. If you bring more healers, you can survive longer and maybe you don’t even need to stack colors.
For Onatel, you can probably survive her firing many times, because she actually reset her mana draining debuff after triggering back to 25%. So you can divide the PT by the number you want and then check your heroes.