When coming to speak about some tanks like justice etc for wars people say stuff like. You just bring a cleanser and time it right and it is very easy tanks to deal with
But…
How many cleansers people have in Average?
Everyone can bring one. maybe even two but if we have whole alliance tanking tank that need cleansers… that can be new strategy
Have tanks of different color but all needs a cleanser to deal with…
So…
How many do you have?..
In the traditional sense of the word, I have 3 leveled. 2 5* and 1 4*.
There are also heroes that aren’t technically cleansers but can be used as such in certain circumstances. These are heroes that overwrite a status ailment. For example, Bold will overwrite Richards -attack and Kiril can overwrite Tibs -def (also Richards -attack).
Including these pseudo-cleansers, I have around a dozen leveled 4 & 5*.
My leveled cleanse-all heroes:
3 legendary maxed: Kunchen, 2x Vivica
1 legendary 3/70: Vivica
2 epic maxed: Rigard
1 rare maxed: Gill-Ra
1 rare not-yet-maxed: Tyrum with Roman Remnant costume 
… okay, that last two won’t see any wars. 
I’ll still be able to bring a cleanser with each flag.
(Additionally to the cleanse-all crew, the Sand Empire heroes have self-cleanse, and (though I don’t have him) Aeron has three-cleanse – but usually when people speak of cleansers, it’s the cleanse-all heroes.)
I’ve got 4. Kunchen, Zim and the Rigard twins. I plan on leveling a 3rd Rigard soon too.
Ariel
Kunchen
Rigard 1
Rigard 2
I only use those Rigards in war, but boy does an average speed cleanse + heal come in handy.
I might level a 3rd Rigard down the road.
To deal with status ailments, I have…
4 Rigards - cleanse all
2 BTs- reverse att down
2 Kirils - reverse att down & def down
Magni - reverse def down on 3
Gandalf costume - reverse def down, heal over time counter damage over time
Kunchen, Zimkitha, Ariel, Rigard (half way through for my second 1), Vivica. All maxed.
Rigard
Rigard
Zim
Viv
Viv
Aeron
Aeron
Locke
Ariel
Working on 2 more rigards, 1 more zim, and possibly a 3rd viv
I have maxed:
Ariel
Vivica
Aeron (cleanse 3 and block ailments)
Rigard
To work on (all 1-1 currently):
Rigard 2
Rigard 3
Vivica 2
Vivica 3
I have:
x1 lv3.50 Gill-Ra
x3 lv4.70 Rigard
x1 lv4.80+11 Vivica
I also have x4 lv1.1 Rigard and x1 lv1.1 Vivica…
I were thinking about taking other 2 Rigard to lv 4.70 but then I drawed Grazul.
In the sense that you probably mean, I’d say 2 and a third, plus an honorable mention:
Rigard (maxed, maxed costume, and currently adding emblems)
Duplicate Rigard (maxed, in progress of maxing costume)
1/3rd: Rumpelstiltskin, because I can’t rely on it
Honorable mention: Mother North, because a hero I revive is cleansed - it works really well!
I also have Gil-Ra, costumed Tyrum, and the self-cleansing Jabbar (all maxed), but they rarely see usage (outside of the raid tournaments).
That said, I strongly agree with @LadySuzanne; often it is better to counter with a hero that not only cleanses, but flips the debuff. I have many many more heroes that do that, though it depends what sort of ailment I’m up against. Even if I can only flip one of multiple ailments that’s sometimes enough. I often look to the following heroes first, before opting for ‘just’ a cleanse:
Mitsuko, Merlin and Proteus (preventing the status ailment before it even happens)
Boldtusk (I have two maxed, one of whom is heavily emblemed)
Kiril (I have two maxed, one of whom is heavily emblemed)
Wilbur, Aegir, and even Danzaburo
Onatel (blind resist)
And I would say any riposter also merits consideration, in that I am often willing to be hurt if it hurts the other side as much or more
Rigard 4.70+12
Sonya Costume 3.something still leveling
Rigard 1.1
Gill-Ra 3.50+1
(Arman & Hisan both 3.50+1 only self cleanse)
Rigard +costume
Sonya in costume
Ariel
Zimkitha
Aeron
GillRa
Tyrum in costume
Setting up 2 in a team against bad ailment dealers can’t be wrong.
On my main, 3 (not counting dupes). Roman Tyrum, Sonya, and Gill-Ra. Stinking Rigard keeps eluding me. Knowing my luck on my main, I will get the costume before the actual hero. Alt #1 has Gill-Ra, Viking Sonya, Roman Tyrum.
I only have Rigard+8 and Rigard as my 4* cleansers. Still waiting on Vivica 
This is when I strongly wish trading was a thing… my wife has no Rigard, but Vivica x2 instead. Wish I had that problem 
It’s part of the reason why I did Gill-Ra+20
@DaveCozy I will always <3 my lovely cleanser merlady. I am gonna take another up to +20 once Tibs and Ameonna are maxed.
I have more than I can list from memory. I only use two, Ariel and Rigard. Rigard just got put back in play after maxing his costume and spent the last 6 months a least collecting dust.
Even so, I don’t even think of their cleansing ability.
Now take away my despellers and I would go into a panic.
Vivica and Rigard.
Then i have Grazul and BK acting as a shield against status ailment, which is pretty similar, if not better.
Great support heroes.
Gill-Ra, Roman Tyrum (not leveled), Rigard and Vivica.
Zim and Rigard.
Most times I don’t even bring one.
Sonya is moving up very slowly there.