Scorch for example. It destroy card with highest power. If 2 or more has got the same amount, one of them should be destroyed randomly, but instead, it destroy all of them. But fog got the same problem. It should deal 2 damage to the card with the lowest power, but affect each of them.
Scorch's description says "Destroy the Highest Unit(s)." This means it can and will destroy more than one card if they have the same strength. Likewise, Fog reads "Damage the Highest Unit(s) on the row by 2." Both refer to units, plural.