There is another thread dedicated to complaining about the event so this one is for tips for helping defeat him (beyond the obvious deny Blue and get a Whales team up - LOL).
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Boost +1 AP all colors. This is probably the most important thing you can do because his 1 turn CD gets placed automatically and if it expires and you have 0 AP (like at the start of battle) he hits you for an annoying chunk of damage. As long as you have 1 AP, you take no damage so this gives you a turn or 2 grace to get your own AP via matches or match his CD.
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Match his CD when possible and when you can’t, look to make sure you have at least 1 AP in the color it’s expiring on so you avoid damage. So that means hunting for a match in that color if you have 0 AP in it.
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Avoid using the Dark Avengers who create weak special tiles (2/3* Daken, 2/3* Bullseye) because that means you are going eat some serious damage from his Black that only costs 3 AP.
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Equip your Chewie support. At Rank 4 mine creates a 369 tile so even if Garg reduces it 2 times via his Black it won’t go under the threshold (it will in later rounds like 6-8 but not the early ones). Getting a few hundred or thousand extra damage per turn adds up in the early rounds (1-4).
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Agent Venom, 5* Yelena and 5* Daken are classified as ‘heroes’. That means they get access to some supports the other characters can’t:
A) A Rank 3 Lockheed reduces damage from enemy powers (my R4 reduces by 1451). It won’t help a ton vs his Blue but it will reduce the annoying passive damage from having 0 AP when his CD expires so you can let that character tank if you are about to eat some damage. -
Carols Communicator can create 2 strong protect tiles (R3 its 45% for 600 strength). That can help with match and power damage and will be immune to his Black until he fires it several times because of the high strength. Also this support provides true healing when matching your own special tiles (works well if another character has Chewie).
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Other supports like Black Widow batons massively increase match damage (Purple) even at R1 and many others give +X AP at battle start (to help combat his CD draining damage).
KGB
P.S. My alliance is in round 4 now and so far I’ve had my L300 Yelena die twice (once from Blue, once worn down from damage over multiple boss battles) and no other deaths (L300 Agent Venom and Scorpion are my other 2 characters). She has Lockhead and Venom has Chewie.