You instantly get $10 million. BUT! For the rest of your life, there is an omniscient, invincible snail that will kill you the moment it touches you. It's always following you trying to kill you. It always knows where you are, can board a plane, can cross the oceans, etc. It does move at snail speed. You'll never know exactly where the snail is.
A lesson without pain is meaningless. That's because no one can gain without sacrificing something. But by enduring that pain and overcoming it, he shall obtain a powerful, unmatched heart. A fullmetal heart.
Since it's omniscient it will guaranteed kill you within around a month if it has human intelligence.
If it has snail intelligence it will just take the shortest path towards you so you can just move every x years to the other side of the globe (it would take it about 50 years to go halfway across the globe, not accounting for elevation), the first move would be x/2 and you should be good the rest of your life.
You can also live in an elevated house with the support beams coated in something it couldn't crawl up if you're extra paranoid.
