Mtg has 2 sided cards and so do a few other games. so aa'une isn't unique in that regard but he did give us something unseen in chaotic before. A win condition. Basically a card effect that either wins you the game or is so powerful that its very unlikely your opponent needs a miracle.
Aa'une should only be played in 1 way really. As a win condition. if you play Aa'une your playing to flip him first and foremost. if you fail you may adopt a different strategy but Aa'une always comes first. you don't just splash Aa'une in your deck for fun since he doesn't do anything unless he's flipped.
When building an Aa'une deck you got to deal with alot of things 1 you need to get at least 4 mc to cast calling of Aa'une. while olligarchs path can help FM are basically a necessity how many varies on the type of deck usually between 2-4. the mugic can also just be negated usally by other mugic so counter negate isn't a bad option. sirilean, candence clash or denial refrain of the deep work pretty well.
next is the baton of Aa'une it gives Aa'une water 5 and 5 energy nothing special but its not useless or anything. in order to use calling of aaune you need to keep him equipped with the baton so if gets destroyed or flipped your outa luck. there are marrilians and locations to help like the coralsmith and the shardcrafters workshop. but using some of that denial also works well. bodal's arsenal can also work to get back the baton if it gets smashed. with the baton and fluid morphers water attacks seem ideal which is weird that aaune has out preform all stat 20 since stats take a back seat to water in his decks usually
rage of aaune is the final peice of the puzzle aa'une needs to play it in combat to cast the mugic however he only needs to play rage it can be negated or reduced to 0 so the only real trouble is waiting to get it in your hand. this is why defenders are key. taking time to build up FM and sift your attacks is big in an Aa'une deck so a couple khralls or some other defenders are probably a smart move to buy some time.
locations should probably all be Aa'une boosters in some way or form since he needs to win the combat to use the mugic so every advantage helps. other mugic you have should also be there to help aa'une win combat anyway you can.
and that's Aa'une in a nutshell
weakness include: gear meddling, mugic meddling, getting attacked too early or in a bad location, really strong fighters, najarin FF, tarterek psi, a dozen things I'm not thinking of, and bad luck
but win conditions should be hard so they don't get abused and if you have won with Aa'une you know its a blast
edit: just read the your question. nah Aa'une as a super ultimate insta-win is what makes him unique and awesome. anything less wouldn't be nearly as fun.
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