Lissandra Dark Star Shepherd Replicator 1g

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Lissandra's Dark Matter ability hurls a dagger towards her target, dealing magic damage to the first foe who gets hit. On impact, it explodes to deal additional damage to nearby enemies.
It's a simple effect, but it gets a lot better when double-cast with Replicator. Although either way, you can't go wrong with a three-trait 1-cost unit.
Veigar Meeple Replicator 1g

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Veigar is a backline AP caster that calls down "Meepteors" on his target. When Meeple is active, he also summons X mini Meepteors with each cast. As a Replicator this gets even sillier, essentially creating a swarm.
It may be simple, but it's hilarious and likely quite effective.
Pantheon Timebreaker Brawler Replicator 2g

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Pantheon's Advanced Defenses makes him a formidable foe, granting a Shield and increased Durability, before dealing physical damage over time within a cone.
As always, Replicator amplifies this further, and even without it, he's still got two other great traits to work with.
Lulu Stargazer Replicator 3g

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Lulu summons things from the sky with her "It's Raining Stars" ability. This deals magic damage to enemies within range, and also applies a unique effect depending on the game's Stargazer Constellation.
At the time of writing this, it's unclear as to what these bonuses are. However, knowing we can double-cast them with Replicator makes Lulu an exciting champion to explore.
Nami Space Groove Replicator 4g

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Nami's Bubble Pop throws a disco bubble towards her target, dealing split magic damage to enemies in range. This also causes an explosion of globs, dealing additional damage to nearby foes.
Each cast of the ability also allows Nami to enter The Groove for a time, making Replicator extremely useful to help extend her duration. While she's quite simple overall, she's got decent potential in a Space Groove comp.
Thanks for reading! If you want to try and come up with your own team comps for Set 17, check out our Team Builder. For a full overview on the new set, check out our TFT Set 17 Reveal Page.