This is a slow and steady strategy. It relies on Sunlight and the healing spells your pets have. It is strong against many popular strategies. It is weak against teams with low-cd weather effects that mess with your Sunlight.
The idea is to cast Sunlight, then Photosynthesis, then swap to your second pet and do the same. From this point your team will be healing for 400+ every turn.
Next you can go 2 different routes:
Keep swapping back and forth between your first 2 pets, casting Sunlight on cooldown, and Photosynthesis before it expires and before swapping. Fill with Crush, or set up a Solar Beam.
Swap to your third pet, up to preference. The possibilites are endless, but in the meantime your Sunflower and Fozling will be healing for 1000+ each.
Your first Sunlight/Photosynthesis pet. I like bringing Solar Beam for when it is safe to nuke. Lash is not bad either. Pick according to your preferences.
Your second Sunlight/Photosynthesis pet. I like bringing Crush, to bring some mixed damage to the team.
This one is mostly up to preference. I don't own Broot nor Blossoming Ancient, but they would go well here. I like using an Elemental with Flying attacks, because it counters what Elementals are weak to: Aquatic pets.
Some examples that go well with the team:
Broot or Blossoming Ancient, 1/2/2. Using a third pet with Sunlight/Photosynthesis makes the strategy even more redundant and annoying to deal with for your opponent.
Drafty. Skills are */*/1 to preference. I like Wind Buffet for the disruption effect, but Cyclone is not bad either. Autumn Breeze is mandatory, both because the effect is really strong, and Sandstorm messes the team strategy up.
Zephyrian Prince. Same as Drafty, but with lower speed, which makes Wind Buffet slightly worse.
Pandaren Air Spirit 2/2/1. Another HoT pet, which meshes very well with the team strategy. Note that Soothing Mist heals the active pet, which can help Sunflower while it recharges. It also has to DoTs, both of which are strong against Aquatic pets.
Jade Tentacle, 1/2/1. Photosynthesis does its thing. Scratch is strong against Undead pets which are popular. Entangling Roots can be used to disrupt, or set up a perfect Solar Beam.
Ruby Droplet, 2/2/1. This one is strong against Humanoids, another popular category of pets. Bubble adds to the frustration for your opponent.
Everburning Treant, 1/2/1. A third source of Sunlight is always welcome. Autumn Breeze is very strong. Club can be used as Humanoid damage if you chose Rock Barrage for your Fozling.
Terrible Turnip, 2/2/1. Extra Sunlight and extra healing need no explanation. Tidal Wave brings reliable backline damage and can remove pesky traps.