What are the effects of having Mars, Saturn, Mercury, and Venus together in the Aquarius sign?

There are multiple parts to the question. Let us go step by step:

Mars-Saturn-Mercury-Venus Conjunction (Being Together in One House of the Horoscope)

Any 2-3 or 4 planetary conjunctions will be crucial and will impact life
Mars-Saturn has a contradictory approach to things. Their conjunction will lead to two steps ahead – four steps backward
Saturn-Venus-Mercury shares a good rapport. This will lead to someone good communication while having the ability to mesmerize the audience
Mercury-Mars is again a contradictory combination (like a diplomat meeting a soldier). This will lead to the burning of bridges when it was not required

Having said this, please note that the outcome will depend on the following points also

Which house is the Aquarius Zodiac?
Which Mahadasha is going on?
Is there any transit happening in the Aquarius Zodiac where 4 planets are present?
What is the level of conjunction?
Is there any positive (Jupiter or Moon) aspect or Negative (Rahu or Ketu) aspect on the Aquarius Zodiac?

Once there is clarity, a bigger and clearer picture can be drawn

Also, I have tried to answer about Mahadasha in detail. You can use it to understand better

Hope this helps

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