Requiring proficiency in the language is reasonable, but requiring everyone to be richer than the average member of the population and have enough money banked to live off of for 30 years seems insane. That goes well beyond simply making sure that people are able to care for themselves.
The US has something like this, but the income threshold is lower.[1] US immigrants in most categories have to show that they will not become a "public charge", that is, need US welfare benefits.
That's reasonable too. People who move to a new country should be able to support themselves there and have a good chance to thrive in their new home. If the average income of the population isn't enough for that to be possible, your country has bigger problems than immigrants
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[1] <a href="https://www.uscis.gov/newsroom/alerts/uscis-issues-guidance-on-making-public-charge-inadmissibility-determination" rel="nofollow">https://www.uscis.gov/newsroom/alerts/uscis-issues-guidance-...
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