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Raiding Party can't be the target of white spells or abilities from white sources.
Sacrifice an Orc: Each player may tap any number of untapped white creatures they control. For each creature tapped this way, that player chooses up to two Plains. Then destroy all Plains that weren't chosen this way by any player.
A player can choose zero or one Plains if they want.
The color of creature to be tapped is set when the effect is announced and even if you use Sleight of Mind after that, you can’t change what color creature needs to be tapped to prevent the destruction.
The creatures are tapped during spell resolution.
