I do not like the passive but I do like the concept. I don't think it'd ever be accepted. If you could give me some more details or ideas that would be cool. Not a lot of kill potential here.
Just off the top of my head I'll rework this champ.
Void mass of tentacles that prefers to eat time rather than flesh. the basic attack is a pulsating orb that moves very slowly and slows things by 4% when near it (40 units).
Passive - Sense of Time - your tentacles drift towards fast moving objects (calculated from the speed of all entities, attacks. abilities weighted heavily on champions then the center of mass, per say, is found. for example if two champions were moving together you'd be attracted to somewhere between them, and the closer to you the more weight the entity has to the calculation and the AoE of your w passive changes) and move you at 2% your movement speed when not moving, also granting an extra 20% movement speed towards the highest point of movement.
Q - Essence of Eons - Create a time void, sucking in all entities (except dragons and stuff) exponentially proportional to 20/40/60/80/100% of their base movement speed (i.e. if they have boots they can escape if all they do is run away, but if they stop to attack they move directly towards the void. in the middle of the void it's 100% their base MS, in the middle it's 1000%, on the edge it's 10%) creating an explosion on contact dealing significant magic damage and throwing out entities proportional to their distance from the center. (knocked up for .5 seconds, this is so it's not op) (same range as void itself)
W - Temporal Greed
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Passive - slow and decreases attack speed of anything that touches your tentacles by 10/15/20/30/40% (applies to abilities and everything that moves at all, for example morgana's stun)
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Active - Lurch you and your tentacles forward increasing their range by 12/24/48% dealing physical damage + AD per second while any champion in contact with your tentacles. (the tentacles overshoot by about 50 units, and retract as your approach them within the 50 units or retract completely if they escape.)
E - Static Void - Gain a charge every 20 seconds, place a time orb that lasts for 2 minutes (aesthetically similar to your basic attack) that drifts towards the fastest moving object within 600 units. When triggered, it slows or speeds up enemies or allies by 10/20/30/40/50% respectively (put this on 
and he's a hella fast boi) for 2 seconds, deals 30/40/60/80/110 + 50/60/70/80/90% AP magic damage and grants vision.
R - Rapid Anhiliation - Grab all nearby champions (double the AoE of your passive) consuming their life force and slowing by 30/60/80%. Deals 60/100/140 +40% AP magic damage per second. Effect continues till enemies escape or an ally enters the zone. (You can move as normal but you cannot cast other abilities.)
Of course the numbers can be changed.
