http://tappedout.net/mtg-decks/selesnia-aggro-20-gw-butt-kicking/?fmt=

Hardened Scales + Phalanx Leader : All your creatures get a lasting +2/+2.

Abzan Falconer + Phalanx Leader : Target the leader, put a +1/+1 counter on everyone, then attack as desired.

Hardened Scales + Reap What Is Sown : Shit just got REAL.

Hardened Scales + Launch the Fleet + Phalanx Leader + Another Heroic Spell: DANG!

Maybe:
* Incremental Growth
* Ajani, Mentor of Heroes
Abzan Battle Priest
Defiant Strike
Eidolon of Countless Battles
Mortal's Ardor
Nature's Panoply
Nyxborn Shieldmate
Plummet
Raise the Alarm
Seeker of the Way
Solidarity of Heroes
Tuskguard Captain
Warriors' Lesson

SB Guide:

Abzan: Bring in 3x Hushwing Gryff, 2x Suspension Field, 2x Pillar of Light, and 2x Glare of Heresy. Take out 2x Ajani's Presence, 3x Abzan Falconer, and 4x Launch the Fleet. This game will probably not be in your favor, so expect the worst.

MGD: Bring in 3x Hushwing Gryff, 2x Suspension Field, and 2x Pillar of Light, and 2x Erase. Take out 4x Launch the Fleet, 2x Ajani's Presence, 3x Gods Willing. This matchup is simple. As they grow, you grow bigger. Keep in mind, I am assuming they are splashing black.

Mardu Control: Bring in 2x Ajani's Presence and 2x Hopeful EidolonMTG Card: Hopeful Eidolon. Take out 4x Launch the Fleet. They have removal and value creatures. Unless you can establish a good foothold mid- to lategame, you're boned.

If you have any more questions on machups, just ask! : )