you wish
(idiomatic, colloquial) Used to express the speaker's skepticism about a preceding statement concerning some desired or assumed state of affairs.
"When I grow up, I'm going to be a superhero!" / "Huh, you wish!"
"They can't bench me. I'm the best shooter on the team." / "You wish!"
If you wish success in life, make perseverance your bosom friend, experience your wise counselor, caution your elder brother and hope your guardian genius. Joseph Addison
Be as you wish to seem. Socrates
If you wish me to weep, you must mourn first yourself. Horace
If you wish good advice, consult an old man. Romanian Proverb
Be careful what you wish for, you might just get it. English Proverb
Be honorable yourself if you wish to associate with honorable people. Welsh Proverb