AD Mana Regen Item [Item Concept]
As far as AD champions go, there are two paths for champions that utilize mana: Manamune (Muramana) for your spam happy champions, and Essence Reaver for your Utility Marksmen. This, however, does not meet the needs of all AD champions. Now, I understand that Mana exists as a resource that limits the user's ability to cast spells, but I think that for a good chunk of AD champions that are not your spamming spell casters or your marksmen have mana problems that could be easily fixed by the addition of a new item:
First, there will have to be an Advanced tier item to make for a more natural progression.
Crystal Blade- Cost: 1100g (400g + Long Sword + Sapphire Crystal) +20 Attack Damage +300 Mana Unique Passive: Soul Blade- Whenever you damage an enemy champion with a spell, you gain a stack of Soul Replenish for every ten physical damage dealt (Up to 25 stacks), lasting 5 seconds (subsequent stacks refresh this duration). You gain 4 mana regen per 5 seconds for every stack of Soul Replenish.
This item will allow the player the ability to gain some mana return without overly rewarding excessive spell casting, and giving them good AD so they don't immediately fall behind. The next step will be the Legendary form.
Blade of Burning Crystal- Cost: 3200g (1000g + Crystal Blade + Serrated Dirk) +65 Attack Damage +400 Mana +10 Armor Penetration Unique Passive: Soul Blade- Whenever you damage an enemy champion with a spell, you gain a stack of Soul Replenish for every ten physical damage dealt (up to 40 stacks), lasting 5 seconds (subsequent stacks refresh this duration). You gain 4 mana regen per 5 seconds for every stack of Soul Replenish. Once you have reached 40 stacks of Soul Replenish, whenever you would gain a stack of Soul Replenish, you gain a stack of Soul Reaver instead, lasting 5 seconds (subsequent stacks refresh this duration). For each stack of Soul Reaver, enemy champions you basic attack will be dealt 1 physical damage per second for 3 seconds (subsequent basic attacks refresh the effect while you have stacks of Soul Reaver).