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.

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Chandra, Roaring Flame

[+1] Chandra, Roaring Flame deals 2 damage to target player.

[-2] Chandra, Roaring Flame deals 2 damage to target creature.

[-7] Chandra, Roaring Flame deals 6 damage to each opponent. Each player dealt damage this way gets an emblem with "At the beginning of your upkeep, this emblem deals 3 damage to you."