Unnerving Assault

two generic mana one blue or red mana Instant

Creatures your opponents control get -1/-0 until end of turn if one blue mana was spent to cast this spell, and creatures you control get +1/+0 until end of turn if one red mana was spent to cast this spell. (Do both if was spent.)

The scales of battle rarely balance.

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Unnerving Assault rulings

2008-08-01
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.
2008-08-01
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.
2008-08-01
Unnerving Assault affects only creatures on the battlefield at the time it resolves. If a creature enters later that turn, it won't be affected.
2008-08-01
If a creature changes controllers later in the turn, that won't change how Unnerving Assault affected it.
2008-08-01
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.