Unstable Footing

Instant    (CMC:1)

Kicker (You may pay an additional as you cast this spell.) Damage can't be prevented this turn. If Unstable Footing was kicked, it deals 5 damage to target player.

A long way down is shorter than you think.

153 ZEN • ENNic Klein

™ & © 1993—2009 Wizards of the Coast

Legal in: Modern,Zendikar Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Classic,Singleton 100,Commander

Oracle Text (click to copy):

Unstable Footing {R} Instant Kicker {3}{R} (You may pay an additional {3}{R} as you cast this spell.) Damage can't be prevented this turn. If Unstable Footing was kicked, it deals 5 damage to target player.

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View this MTG card on Gatherer

10/1/2009
Unstable Footing's effect causes damage from all sources to be unpreventable, not just damage from Unstable Footing itself.
10/1/2009
If damage can't be prevented, damage prevention shields don't have any effect. If a prevention effect has an additional effect, the additional effect will still work (if possible). Spells that create prevention effects can still be cast, and abilities that create prevention effects can still be activated.
10/1/2009
If damage can't be prevented, static abilities that prevent damage (including protection abilities) don't do so. If they have additional effects that don't depend on the amount of damage prevented, those additional effects will still work. Such effects are applied only once per source of damage.
10/1/2009
Effects that replace or redirect damage without using the word "prevent" are not affected by Unstable Footing.
10/1/2009
If a creature is dealt lethal damage, it can still regenerate. If it does, the damage marked on it will be removed from it.
10/1/2009
If Unstable Footing is kicked and the targeted player is an illegal target by the time it resolves, the entire spell is countered. Damage can still be prevented.

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Card Unstable Footing is not on TCGPlayer.