So your deck is no longer active...

[bucky1andonly]

You're probably a little annoyed at the fact your deck is no longer active in the arena.  This means you won't be earning that minuscule amount of electrum, but more importantly, you don't get to brag about how well it is pwning newbs.

There is a solution to help get your deck back into the top 500.  It is really quite simple and the more I type the more I stall from actually telling you what exactly that possible solution is which will help alleviate this annoyance of being knocked out.  Maybe you were knocked out for only losing, maybe you win and lose the same amount, or maybe you just don't have enough wins overall.

So what is this solution I keep evading?  Well here it is - Play against the other arena decks in the same category your deck is in, AND WIN, also, if you come across your deck, LOSE on purpose.  There is no point in sitting on the sidelines playing against the bronze/silver/platinum if your deck is in gold but not active.  Play against gold and help get that deck of yours active once again.  It doesn't pay to just wait until other people have their decks lose a lot, you must participate.

[Toge111]

How do you know you'll win against everyone else?
Does it gain to lose against your own deck - a few rating points for 15 electrum?
What if your deck just sucks and other players will bring it down?

[bucky1andonly]

Q. How do you know you'll win against everyone else?
A. You don't know, but you want to make a deck that is strong enough to win most of the time. 

Q. Does it gain to lose against your own deck - a few rating points for 15 electrum?
A. If you want your deck to move up in rank then yes.  If you would rather have the 100+ electrum (possibly) then by all means take that option.

Q. What if your deck just sucks and other players will bring it down?
A. Construct a new deck.  If you lack cards, there is still always AI 0-4 plus FG's to play against to earn more cards.

[adrix89]

Not sure how relevant it still is but on your first arena deck  won't matter that much since you don't have other cards to synergy with the oracle ones(and you will have shit level anyway).
Better to build a good deck and challenge the silver( 15 cost to fight versus ~65 reward,me sees profit and  the stats are not OP like half bloods)

You can reset the rank if you build an new oracle deck(and your level will update to current)

[Elite arbiter]

Actually, I'm pretty sure that its the exact opposite of what you're suggesting, rather that to get your deck better stats you'll want to play another league rather than your own. Especially if you already know you don't know if you can win against opponents. Reasoning follows that if you lose it makes the person who beat you get a higher chance relative to your deck, which will happen unless you can win more than you can lose, which isn't always easy to guarantee. Whereas if you play other leagues, then those leagues overall get more plays, and the amount of electrum weighted to them goes down, and the electrum to others goes up. So this makes whichever league you play in less attractive for others, and the others more so by following that logic. Which unlike your suggestion where if you lose you hurt your chances but if you win you help them, this always helps.