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Describe the Bug:
When Archmage Ascension has 6 counters on it and its controller would draw a card, he/she can click on Archmage Ascension to tutor for a card, but still draws a card after the library has been shuffled (I haven't checked whether the AI gets to draw a card after tutoring).

Putting a quest counter on Archmage Ascension at end of turn is mandatory, if its controller has drawn 2 or more cards that turn.

Once there's 6 counters on Archmage Ascension, no more quest counters can be put on it at end of turn, if its controller has drawn 2 or more cards that turn.

Which card did behave improperly ?
Archmage Ascension

Which update are you using?(date,name)Which type(Duel,Gauntlet,Sealed Deck)
April 17 2014, duel

What exactly should be the correct behavior/interaction ?
If a player would draw a card and chooses to search his or her library for a card with Archmage Ascension, that effect replaces the original card draw.

If Archmage Ascension 's controller has drawn 2 or more cards on a turn, he/she may put a quest counter on Archmage Ascension at the end of that turn.

Quest counters can be put on Archmage Ascension, no matter how many quest counters are already on it.

Are any other cards possibly affected by this bug ?
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Fixed Archmage Ascension in c49ec78.

A lot of the Zendikar block quests and expeditions and such have the same behavior with their counters. I mostly just left them alone when migrating to quest counters.

Still doesn't get more than 6 counters.

Fixed in commit 4d8bd79d raised the limit to 150 which covers even big decks and still let you gain from counters being put on permanents for cards that look for that.