The corrected sentence is: "Omar and I have an extra ticket to the baseball game tonight, and we'll give it to whoever wants it."
Here are the changes made and the reasons for each:
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"myself" to "I": "Myself" is a reflexive pronoun used for emphasis or to refer back to the subject when it's the same person. In this context, "I" is the correct subject pronoun to use when referring to the speaker along with Omar.
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"has got" to "have": "Omar and I" (which is plural) takes the plural verb "have." "Has got" is also informal and can be replaced with "have" for simplicity and proper grammar.
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"a extra ticket" to "an extra ticket": The article "a" should be "an" before a vowel sound, which is present in "extra."
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"well" to "we'll": "Well" is an adverb; here, the contraction "we'll" (short for "we will") is appropriate to indicate future action.
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"whomever" to "whoever": "Whoever" is the correct usage here because it is the subject of the clause "whoever wants it." "Whomever" is used as the object of a verb or preposition, which is not the case in this context.
Overall, these changes improve the grammatical accuracy and clarity of the sentence.