Lightning Axe

Instant    (CMC:1)

As an additional cost to cast Lightning Axe, discard a card or pay . Lightning Axe deals 5 damage to target creature.

"A gargoyle's meat can be carved with an ordinary cleaver, but for its petrous hide . . ."

168 TSP • ENDan Scott

™ & © 1993—2006 Wizards of the Coast

Legal in: Modern,Shadows over Innistrad Block,Time Spiral Block,Legacy,Vintage,Commander

Oracle Text (click to copy):

Lightning Axe {R} Instant As an additional cost to cast Lightning Axe, discard a card or pay {5}. Lightning Axe deals 5 damage to target creature.

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View this MTG card on Gatherer

9/25/2006
This has an additional cost with an option. Essentially, the card’s cost to cast is either  or  and a discard. But its mana cost is always  and its converted mana cost is always 1.
4/8/2016
The converted mana cost of Lightning Axe is 1, independent of which additional cost you paid.

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