Two new Items [Item Concepts]

OK, so I came up with two new items I'd like to share with you. Here they are:

Item Name: Enchanted Assault

Stats: +10% Attack Speed +10 Attack Damage

Passive: Unique - Sword's Witchery: After using a basic attack, your next ability within 10 seconds deals (50% AP) bonus magic damage (1.5 second cooldown)

Recipe: Long Sword

Cost: 1050 (700)

Sell: 735

Why? "Inverse" Sheen

Item Name: Continuous Alternation

Stats: +15% Cooldown Reduction +375 Mana +15 Attack Damage +15% Attack Speed

Passive: Unique - Sword's Witchery: After using a basic attack, your next ability within 10 seconds deals (100% AP) bonus magic damage (1.5 second cooldown) Unique – Spellblade: After using an ability, your next basic attack within 10 seconds deals (200% base AD) on-hit bonus damage (1.5 second cooldown).

Recipe: Sheen + Enchanted Assault

Cost: 3100 (1000)

Sell: 2050

Why? Interesting addition to Sheen.

Do you think these would be OP? Or too weak? I want your feedback!