Mai’s level reward cards and duel reward cards make it possible for player to construct a deck with Harpie-theme although in current obtainable card pool there are not much card that could directly provides advantage to Harpie-theme deck right now. → Haripie deck
Obtain unique skill drop reward
Mai is the character that could be able to gain several unique skills (and those skills are also associated with Harpies). It is suggested that player use her to duel with legendary duelists level 30-40. As most of the records seems to reported that she obtained those skill in that way.
Don't give priority to a duel against her
Although her duel reward card contains all the essential card that could be use to either enhance “Harpie Lady” theme-deck or construct “Amazoness” theme-deck, those deck are not competitive in the meta currently.
Mai Valentine’s level 40 deck is considered as one of the most difficult opponent to take care of, if the player only depends on high attack monster only. → Deck to get 6000 score against Mai
Note: More skills are expected! Report Skill name and details by submitting comments or screenshot at the bottom of the page.
You just need a basic stall deck. Rex is weak to play against, so what I use are:
Mystical Beast of Serket
Temple of the Kings
Union Attack x2
Secret Pass to the Treasures
Shard of Greed x2
Jar of Greed x2
From there any heavy beater cards you have and counter traps, in my case I run a Mirror Wall and SRH plus any monster with at least 1650 atk.