Undergrowth

Instant    (CMC:1)

No creatures deal damage in combat this turn. If you pay in addition to the casting cost, Undergrowth does not affect red creatures.

"It is the work of sorcery. Burn it"Taaveti of Kelsinko, Elvish Hunter

AL • ENPat Morrissey

™ & © 1993—1996 Wizards of the Coast

Legal in: Ice Age Block,Legacy,Vintage,Commander

Oracle Text (click to copy):

Undergrowth {G} Instant As an additional cost to cast Undergrowth, you may pay {2}{R}. Prevent all combat damage that would be dealt this turn. If its additional cost was paid, Undergrowth doesn't affect combat damage that would be dealt by red creatures.

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View this MTG card on Gatherer

10/4/2004
It means that red creatures still deal damage if you pay the additional cost.

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Card Undergrowth (Holding Axe) is not on TCGPlayer.