Starcraft 2

Replicant. Replicate: Ghost/Infestor. Emp those stupid medivacs and terrans are DONE! WHOOOOOOOOO!!!!!! Basically, we get high temps and the other race's spell caster as well, pineapple yeah.

Only applies to units within your vision. If it's not in your vision you can't replicate it. I'm just curious if you can replicate mules. But yeah, replicating Ghosts in PvT will be huge.

Oracle. Non-detector overseer? Unless it's cloaked (op) it's useless imo. If it's cloaked, that's definitely unfair to other races.

It has other abilities too. Can warp out both enemy and friendly production buildings (can be used offensively or defensively) It also blocks mineral patches.

Tempest. I'm cautious. While Carriers are basically the strongest unit in the game in a lot of ways, and ups scale better with the carrier than any other unit, they just seem so soft.

It's a Thor in the sky. Really needed for Protoss since protoss anti air sucks. All it reasonably has is stalkers. Void Rays are good for extra dps, but they don't fare well as anti air (vs Vikings/Corruptor) Technically Phoenix are supposed to counter Mutas, and they do when mutas are in low numbers, but the amount of micro needed to fend off a huge flock of them is out of the question. The fact that it builds faster and is cheaper than a carrier helps a lot too.

Answers in bold.