Lin-Ti, Burning Heart

{3}{r}{r}, {t}: Deal 5 damage to any target. Lin-Ti, Burning Heart doesn't untap during your next
untap phase.
At the beginning of your main phase, add X colorless mana to your mana pool equal to your devotion to red. Spend this mana only on the {x} cost on cards with "flame", "fire", "burn", "inferno", "scorch", "ember", "incinerate", or
"blaze" in their name.