Instant Kicker {8}{R} (You may pay an additional {8}{R} as you play this spell.)
Urza's Rage can't be countered by spells or abilities.
Urza's Rage deals 3 damage to target creature or player. If the kicker cost was paid, instead Urza's Rage deals 10 damage to that creature or player and the damage can't be prevented.1
10/4/2004: This spell has a self-replacement in it . This means that if you pay the kicker cost, the 3 damage is replaced with 10 unpreventable damage before any other replacements can be applied. For example, you can't use Healing Salve to prevent the 3 damage before it gets changed.
10/4/2004: You can target this spell with spells and abilities, so you can change its target. Those spells and abilities just can't counter it.
10/4/2004: The damage is unpreventable, but it can be affected by replacement effects.
10/4/2004: It can be countered by game rules, such as by having all its targets be illegal. Game rules are neither spells or abilities.
10/4/2004: Counterspells can be played that target it, but when they resolve they simply don't counter it since it can't be countered.