Ezreal (1G) - Sniper

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Ezreal is a sniper at only 1 cost. His ability Temporal Shot has the active where he fires a blast at the current target that deals AD + AP (AD) physical damage. Every number of takedowns he gains a drone that deals (AD) physical damage to the current target on cast.
Ezreal is likely the primary carry and rerolled to 3 stars in this composition. If you have a lot of Ezreals and a Milio or Pantheon, then look to play this reroll Ezreal composition!
Milio (2G) - Fateweaver

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Milio is a 2 gold unit with the ability Ultra Mega Time Kick. He kicks a ball at the enemy that deals (AP) magic damage. On impact, the ball has a 100% chance to bounce to a new target dealing (AP) magic damage. These bounces can trigger additional bounces, but the odds halve with each bounce.
Fateweaver gives the units precision. The trait itself also gives effects lucky which heightens the chance of bounces to trigger.
Pantheon (2G) Brawler + Replicator

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Pantheon has the ability Advanced Defenses where she gains AP Shield (Health & AP) shield and durability for seconds. Over the duration, deal true damage per a second (AD) physical damage each second to enemies in a cone.
Riven (4G) - Rogue

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Riven has the ability Time Warp. She has the passive ability where this ability adapts to Riven’s attack damage or ability power - whichever is higher. Attacks deal passive damage in AP or AD depending on which is higher.
With her active, she dashes to a nearby hex, gaining shield and slashing adjacent enemies for damage. Every third cast, leap into the air and launch a wave of energy that deals damage to enemies in a line.
I always love when Riot adds versatile champions like this that have AP and AD option as you are not item locked and have more flexibility than most other units when you have units like Riven.