3 nasty consequences of creating a time paradox.
1. You're god.
You find yourself in a world where you have all encompassing, abject power. From outside it looks as if you burst into flame and burn forever, out of sight, never consumed. Within the flames, though, your universe pops and sizzles, and you will stay here forever until you use your limited omnipotence to resolve the paradox. This has the effect of taking you out of time indefinitely, meaning you usually are deprived of whatever you wanted to achieve with that paradox. It also means that anything around you burns, because you're like a small sun on earth, and even stone melts beneath you. You can kill cities from the heat. None can come help you or communicate with you, and if they WISH you out of your state, the wish undoes whatever made the paradox, undoing your efforts.
2. Tachyon Hyenas.
You can't kill them, because their younger selves from before you killed them or their ancestors or their descendents will appear and stop you. They arrive in twos and quickly escalate until they have completely devoured you. They eat only that which fucks with time, which is their territory. They are ultra aggressive and love time travelers and people who cause paradoxes. Before you travel time or cause a paradox, you can hear "laughing."
3. Doc Daneeka
Time and space are constant, two things cannot exist in the same place, effect shouldn't precede cause, you know the drill. Picture timespace as a bag with 1 thing in it, all that bag has room for. When you create a paradox that puts 2 things in the bag, and it has to squeeze something out to make room. That's you. No one will acknowledge you ever again, because no one can hear you. If you have magic, you don't now, because your words are without power and your god can't find you. You may not attack or affect anything around you. You still need food and water and air and sleep but those things the universe will conspire to deny you. The only power you have is to speed up how fast time goes by for you, and in discovering and experimenting with that power you will likely waste to death quickly. There are probably countless such individuals around us at all times.