Ty, now i understand how it works, i thought it worked like old OTK pal with Hemet, holy wraths and molten giants. But this is still too slow comparing to other OTK decks.

This is more lottery OTK then stable OTK concept, add Hemet FFS

No Princess Huhuran?

Doubt it, with this quest huter would like to have 2 thunder rhinos in their deck

Theoreticly the quest can be easily coutered by mana wraith or nerubar weblord.

But what if 1 mana creature has its cost increased by mana wraith/freezing trap/nerubar weblord or its cost reduced by pint-sized summoner/shadowstep or any other cards that change mana cost of minion, does it count as 1 mana for the quest? Or the opposit what if non 1 mana minion gets reduced/increased to 1 mana?

I believe that mechainic has creature transformed when its played but not when its in hand. So when you played creature from Zerus you pay 1 and transformation takes cost of the creature-1 mana.

Also wonder do non 1 mana cards that were reduced to 1 mana by Emperor Taurisan count as 1 drop?

I know, but the card played from Zerus has its animation, also in a battle log it is listed as Zerus.

Do creatures that were transformed from Shifter Zerus count as 1 drop?