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Questions & Answers about Ich komme auf jeden Fall.
Why does this sentence translate to "I am definitely coming" when there is no word for "definitely"?
Why does the word jeden end in "-en" here?
The phrase uses the masculine noun der Fall (the case). In this specific expression, the preposition auf requires the accusative case. That means the word for "every" (jeder) takes the masculine accusative ending, becoming jeden.
Since I am coming in the future, shouldn't it be Ich werde kommen?
You can use the future tense, but German speakers usually just use the simple present tense (Ich komme) to talk about the future. As long as the context makes it clear you mean a future event, the present tense sounds very natural and is generally preferred.