if [A] is possible, then [B]
Expresses a hypothetical condition, implying that if the action in A is possible, then B will follow, often with a sense of uncertainty or a challenge.
ものなら is used to set up a condition that is uncertain or unlikely. When attached to a verb's dictionary form, it often implies 'if you can do A, then B' or 'if A were to happen, then B'. It can express a wish or a threat. For example, with potential verbs like できる or 行ける, it means 'if you can...'. With the ば-form, it creates a hypothetical that is contrary to fact or highly unlikely, often leading to a statement of what the speaker would do.