This deck is Naya because of a card but Selesnya in essence.
Decks Flaws:
Your creatures need to stay in the battlefield for being able to grow strong so any control is very effective and you need several turns to battle against strong early creatures.
Deck Advantages:
Once your creatures start to have counters in them they can get really strong so it is a very reliable deck against others that focus their strategy in making their creatures stronger too. Your opponent may underestimate your power increasing tempo and may not be prepared for surprises.
This deck main strategy is combining usual and loyalty counters with proliferation and some life-gaining methods to keep you alive.
SYNERGIES
Nissa, Who Shakes the World ultimate + having at least one creature with a counter on it + Evolution Sage. This can happen early enough to make you proliferate 5-6 times in one turn (if you have already played 6-7 forest). This can create an army of strong creatures in an instant, moreover Nissa recovers loyalty counters.
Mowu, Loyal Companion + Rhythm of the Wild makes a 5/5 with vigilance and trample for 4 mana. It is very cost-effective.
Awakening of Vitu-Ghazi with Nissa's emblem this strong creature becomes indestructible, no Dismember or Murder will be able to stop this creature.
Incubation Druid This creature second ability speeds up the match so much.
Ajani, the Greathearted -2 is astonishingly powerful in this deck. if you proliferate once, use this ability and Nissa, Who Shakes the World+1, Her -8 will be available in the next turn.
The combination of planeswalkers make your creatures have vigilance, flash and adding one mana of any color, this abilities combination gives the deck some adaptability.
Rhythm of the Wild not only ensure you are able to cast the creatures you need but it synergies extremely well with every spell you can find in this deck and that is why I decided to include this card here.