WM LOB 3.0

Wave Master - Stun/Flank
Healing Ranger - Heal/Anti-CC
Swordsman - Damage/Flank
Giant Skeleton - Tank
Mini Pekka - Mini-Tank/Support
Dart Goblin - Damage

Upgrade Priority
Healing Ranger 1/3/2
Swordsman 3>2>1
Giant Skeleton 1>3>2
Mini Pekka 2/1>3
Dart Goblin 1>2>3

Matchups
Barbarian King 80/20
Archer Queen 60/40
Monk 60/40
Shield Maiden 60/40
Wave Master 50/50
Countess 40/60
Skeleton King 40/60
Royal Champion 100/0

Wave Master's 3rd ability lets you lob Swordsman to the other side of the arena. In most cases, swordsman does flank damage with wm and dart goblin does late game damage in the round to finish off enemies and gain boast, but against healing decks, you want to play giant skeleton. Always play your wave master and giant skeleton/swordsman combo on either the middle or mid left or mid right lane.

Giant Skeleton is used against the enemy's damage dealers. You can to upgrade his 1st star in most scenarios. The Mini pekka's dissipate is very useful in situations where the enemy has a lot of minis that require energy. Giant Skeleton 1st and 3rd star can be lobbed to counter archer queen and barbarian king bunker, destroying their low HP troops.

Against enemy flanks, you want to play it to your advantage and maximizing the use of both of your damage dealers, swordsman. And give dart goblin the advantage in the backline to stack and deal damage overtime. While one of them can be lobbed to the other side of the arena, one of them can stack and deal late game damage in the same round.

Do not use war toot unless your enemy has a very heavy stun deck. Using war toot will disable your Wave Master's 3rd star ability. The wave master will not lob your mini to the other side of the board. Use the war toot only when the enemy has a crazy amount of stuns, for example a full stun deck with mega knight, electro wizard and ice wizard.

Pancaker can heal your troops that are being lobbed to the other side of the arena to give them more survivability to deal more damage and give off more value.