Unnerving Assault

Instant    (CMC:3)

Creatures your opponents control get -1/-0 until end of turn if was spent to cast Unnerving Assault, and creatures you control get +1/+0 until end of turn if was spent to cast it. (Do both if was spent.)

The scales of battle rarely balance.

114 EVE • ENRon Spencer

™ & © 1993—2008 Wizards of the Coast

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

Oracle Text (click to copy):

Unnerving Assault {2}{U/R} Instant Creatures your opponents control get -1/-0 until end of turn if {U} was spent to cast Unnerving Assault, and creatures you control get +1/+0 until end of turn if {R} was spent to cast it. (Do both if {U}{R} was spent.)

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View this MTG card on Gatherer

8/1/2008
The spell cares about what mana was spent to pay its total cost, not just what mana was spent to pay the hybrid part of its cost.
8/1/2008
The spell checks on resolution to see if any mana of the stated colors was spent to pay its cost. If so, it doesn't matter how much mana of that color was spent.
8/1/2008
If the spell is copied, the copy will never have had mana of the stated color paid for it, no matter what colors were spent on the original spell.
8/1/2008
Unnerving Assault affects only creatures on the battlefield at the time it resolves. If a creature enters the battlefield later that turn, it won't be affected.
8/1/2008
If a creature changes controllers later in the turn, that won't change how Unnerving Assault affected it.

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Card Unnerving Assault is not on TCGPlayer.