It's the last day of Standard, so I was wondering if it would be more cost efficient to just stay in Rank 5 and practice new decks or actually strive for Legend to take advantage of the people that might just be practicing as well?
My understanding was that legend provided only one benefit over rank five: the cardback. If you have that and don't care about the sense of achievement stick to playing fun stuff or practicing, if not it is your decision, whatever you would enjoy, also the slog to legend is hard, when you reach rank five you are at a point where all you have to do is put in the time, and the last day may not be enough time.
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Just fill your deck with one drops, that is creative deck design, right?
Getting from rank 5 to legend takes about as many games as getting from rank 20 to rank 5, assuming you maintain the same win rate. If you can play that many games in a day, go for it, but I myself would probably save my energy for the new season and try to get to rank 5 earlier in the month. :)