Urza's Rage
Instant
Kicker 
(You may pay an additional as you cast this spell.)
This spell can't be countered.
Urza's Rage deals 3 damage to any target. If this spell was kicked, instead it deals 10 damage to that permanent or player and the damage can't be prevented.
Illustrated by
The List#C15-169RareEnglishLegality
Rulings
Jun 14, 2019
A spell or ability that counters spells can still target Urza’s Rage. When that spell or ability resolves, Urza’s Rage won’t be countered, but any additional effects of that spell or ability will still happen.
Jun 14, 2019
If the target for Urza’s Rage becomes an illegal target, the spell won’t resolve and will be put into its owner’s graveyard with no effect. This is true even if its damage can’t be prevented and even though it can’t be countered.