Orim's Thunder

Kicker {R} (You may pay an additional {R} as you cast this spell.)
Destroy target artifact or enchantment. If Orim's Thunder was kicked, it deals damage equal to that permanent's converted mana cost to target creature.

Kicker {R} (You may pay an additional {R} as you cast this spell.)
Destroy target artifact or enchantment. If this spell was kicked, it deals damage equal to that permanent's mana value to target creature.

Kicker {R} (You may pay an additional {R} as you play this spell.)
Destroy target artifact or enchantment. If you paid the kicker cost, Orim's Thunder deals damage equal to that artifact or enchantment's converted mana cost to target creature.

Dominaria Remastered

Commander Anthology Volume II

Kicker {R} (You may pay an additional {R} as you cast this spell.)
Destroy target artifact or enchantment. If this spell was kicked, it deals damage equal to that permanent's converted mana cost to target creature.

Commander Anthology

Commander 2015

Kicker {R} (You may pay an additional {R} as you cast this spell.)Destroy target artifact or enchantment. If Orim's Thunder was kicked, it deals damage equal to that permanent's converted mana cost to target creature.