Summon Ojama Knight or Ojama King as early as possible. They have enough defense to stall Mai's strongest monsters and with 0 attack Mai cannot use Amazoness Fighting Spirit to boost her attack.
After that just keep stalling until you deck out. Ojama Blue and Jar of Greed helps you get Ojamas out of your deck, King of the Swamp helps you search Polymerization in your deck. You can also use these cards to help fusion summon Ojama Knight earlier, if you have not yet.
Sylvans with Ra. Yami Merricks "Power of the tributed" ability.
Stall until last cards in deck and then summon Ra + activate effect to have over 10,000 attack if you don't take any damage which is ez with Sylvans high attack units. Clear her field throughout the fight so she can't tribute summon.
Element united's deck is very bad if you don't recover your life point as fast as posible you could lost with amazoness archer since there are amazoness village it'll be useless to destroy her monster.
There can only be one effect per skill you stupid moron.
If it's a field spell skill, that's all there is. You can't use a skill that gives a field spell and also allow you to bring that field spell back from the grave. Skills don't work like that in the game.
The Witchy Unicorn
I used my Gladiator beast deck to defeat her (3 consecutive wins)