This page shows in what ways Gideon is strong against Rampage. Or in other words what actions should Gideon do to deal maximum damage to Rampage. Note: any hero isn't always strong or weak against another one. It depends on many different factors so please keep that in mind while adding your tip.
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Be mindful of when he used his ult last. It will regen his health, giving him a good second wind, and negating the damage you dealt to him with yours black hole