The Planeswalker strategy is still possible in the current Standard metagame dominated by Siege Rhinos and Hangarback Walker. This decklist I have found focuses on the Naya colors in a late game plan while protecting the life total and keeping the opponent’s board clear with sweep cards.

Here is the deck played by Robert Meeker which got into the Top 4 in the TCGplayer Open 5K Orlando, FL last 8/29/2015:

MAINDECK
4 Courser of Kruphix
3 Den Protector
1 Dragonlord Atarka
4 Nissa, Vastwood Seer
Creatures [12]

1 Ajani, Mentor of Heroes
4 Elspeth, Sun’s Champion
2 Sarkhan, the Dragonspeaker
2 Ugin, the Spirit Dragon
3 Xenagos, the Reveler
Planeswalkers [12]

4 End Hostilities
4 Seismic Rupture
1 Valorous Stance
Spells [9]

4 Forest
2 Mountain
3 Plains
4 Temple of Abandon
4 Temple of Plenty
2 Temple of Triumph
4 Windswept Heath
4 Wooded Foothills
Lands [27]

SIDEBOARD
2 Arashin Cleric
2 Celestial Flare
2 Glare of Heresy
4 Hangarback Walker
2 Reclamation Sage
1 Soul of Theros
1 Unravel the Aether
1 Windstorm