If one of the spells I have can make the enemy sacrifice a plainswalker but i choose the plainswalker from the game and I do that to a general is not the general banned from the game forever?
closed as unclear what you're asking by doppelgreener, TheThirdMan, JonTheMon, monoRed, SocioMatt May 30 '17 at 20:09
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Nope. When a general/commander leaves the battlefield, it's owner may choose whether to return it to the command zone or let it go to wherever it would have gone otherwise (library/hand/graveyard/exile).
From the rules:
903. 9. If a commander would be exiled from anywhere or put into its owner’s hand, graveyard , or library from anywhere, its owner may put it into the command zone instead. This replacement effect may apply more than on ce to the same event. This is an exception to rule 614.5
Your question is a bit vague but clearly deals with this rule here and so I suspect that it answers your question.