The List

Chandra, Fire of Kaladesh // Chandra, Roaring Flame

Whenever you cast a red spell, untap Chandra, Fire of Kaladesh.
{T}: Chandra, Fire of Kaladesh deals 1 damage to target player or planeswalker. If Chandra has dealt 3 or more damage this turn, exile her, then return her to the battlefield transformed under her owner's control.

From the Vault: Transform

Whenever you cast a red spell, untap Chandra, Fire of Kaladesh.
{T}: Chandra, Fire of Kaladesh deals 1 damage to target player. If Chandra has dealt 3 or more damage this turn, exile her, then return her to the battlefield transformed under her owner's control.

Magic Origins

Whenever you cast a red spell, untap Chandra, Fire of Kaladesh.{T}: Chandra, Fire of Kaladesh deals 1 damage to target player. If Chandra has dealt 3 or more damage this turn, exile her, then return her to the battlefield transformed under her owner's control.