The idea is simple, get Fabled Hero on table, use other creatures for support, cast Selesnya Charm and other instant on creatures (Fabled Hero gets +3/+3 from this cast AND trample so he can do 10 damage and/or deal with blocker) in deck... win the game.
Hopeful Eidolon is there for lifelink, but it can be a bad idea since I'm looking at him as Bestow for late game but still he can be used as 1 mana drop.
Bad: Untill 3rd turn this deck deals only 8 damage:1: Plains + Hopeful Eidolon
2: Attack, Plains, Phalanx Leader (1 dmg)
3: Forest, Attack + Selesnya Charm on Phalanx Leader (5 + 2 dmg)
Good: It can win on turn 4:
1: Plains + Hopeful Eidolon
2: Plains + Phalanx Leader and Attack (1dmg)
3: Forest + Fabled Hero and Attack (2 dmg)
4: Forest, Attack, Selesnya Charm on Fabled Hero AND any of followings:
another Selesnya Charm on Phalanx Leader / Fabled Hero
OR Ordeal of Nylea on Fabled Hero
OR Solidarity of Heroes on Fabled Hero
OR Launch the Fleet before attack on Fabled Hero and Phalanx Leader
OR Ajani's Presence on Fabled Hero (also saves from destroys)
OR Bioshift from Phalanx Leader to Fabled Hero (this option gives additional 3 +1/+1 counters on Fabled Hero, and keeps mana for something else if you still have another card like Ajani's Presence in hand)
each of this options deals damage (in sum with previous turns) 20 or more damage.