Ensuring Chandra flips is challenging; I think her's is the hardest of the Origins Planeswalkers. The easy answer, is a deck of red creatures with cards like
Crowd's Favor,
Fall of the Hammer, and
Ride Down if you splash white. Of those,
Crowd's favor is the most situational. Theoretically, you could flip her turn 3 after hitting all three land drops, with no more than 1 tap land.
Generator Servant on turn 2.
Tap and sac on turn 3, cast Chandra using mana from the Servant. Attack, cast
Crowds Favor, ping with Chandra, She flips.