Desert Survival + Plant Cards

[Zeppeli Gyro Supreme]

Edited cards from my very old fanfic, based on desert perils and other such things.
[spoiler="Monsters"]Oasis Lurker
Water/Reptile/8/2000/3000
You can Tribute Summon this card during your opponent's Battle Phase. When your opponent declares an attack, you may switch all monsters you control to face-down Attack or Defense Position and shuffle them. During each of your Standby Phases while this card is in face-up Attack Position, draw 1 card.

Desert Gator
Earth/Reptile/4/2000/0
This card cannot be Normal Summoned. When this face-down card is selected as an attack target, you may discard a card from your hand to change this card to face-up Attack Position.

Desert Cobra
Earth/Reptile/3/1600/200
When this Defense Position card is destroyed, destroy 1 monster your opponent controls.

Dune Mantis
Wind/Insect/4/1400/1600
Once per turn, you may destroy 1 face-up Spell or Trap Card on your side of the field to destroy a face-up card on your opponent’s side of the field.

Sand Mummy
Earth/Rock/4/1900/400
This card inflicts piercing damage. When this card is destroyed as a result of battle, you take 800 damage.

Dune Survivalist
Wind/Warrior/4/1400/1650
When this card is Normal Summoned, you may add 1 “Desert” or “Dune” card from your Deck to your hand.

Desert Owl
Wind/Winged-Beast/2/500/500
You may choose the Battle Position of a monster this card attacks. When this card is sent to the Graveyard due to a card effect, draw 1 card.

Desert Scorpion
Earth/Insect/4/1500/1500
You may Special Summon this card from your hand by changing the Battle Position of 1 monster you control. This card cannot declare an attack the turn this effect is activated. When this card is destroyed as a result of battle, decrease the ATK of all monsters your opponent controls by 300.[/spoiler][spoiler="Desert Perils"]Double Soul Bind
Normal Spell Card
Activate this card only in a column where you control a monster. Destroy all monsters in the same column as this card.

Shimmering Oasis
Continuous Spell Card
Once per turn, during your Main Phase, you may change the Attribute of 1 face-up monster on the field. During each of your End Phases while your opponent controls a face-up WATER or FIRE monster, draw 1 card.

Desert Mirage
Continuous Spell Card
While you control only EARTH and WIND monsters, your opponent cannot activate Trap Cards during the Battle Phase. When you inflict Battle Damage to your opponent’s Life Points by attacking directly, add 1 EARTH monster from your Deck with 500 DEF or less from your Deck to your hand. This card is then destroyed.

Sand Dune
Continuous Spell Card
Decrease the ATK and DEF of all non-WIND and EARTH monsters on the field by 400. When this card is destroyed, inflict 800 damage to your opponent’s Life Points.

Whipping Sands
Quick-Play Spell Card
Destroy the face-up monster with the lowest ATK on the field (if there’s a tie, you choose).

Great Thirst
Quick-Play Spell Card
Decrease the ATK and DEF of a monster on the field by its level x200, then inflict an equal amount of damage to both player’s Life Points.

Desert Trials
Quick-Play Spell Card
Select 1 card on the field. Destroy the selected card and all face-up monsters you control. Then inflict 400 damage to your opponent’s Life Points for each monster destroyed by this effect.

Drought
Normal Trap Card
Activate only during your opponent’s Main Phase 1. Pay 1000 Life Points. Destroy up to 2 face-down Spell or Trap Cards on the field and decrease the ATK and DEF of all non-EARTH and WIND monsters on the field by 500. [/spoiler]
[spoiler="Unrelated Plant Cards"]Sunflower Dragon
Earth/Plant/5/2000/2000
Once per turn, you may discard a card from your hand to destroy 1 face-up monster on the field.

Fertile Meadow
Field Spell Card
Increase the ATK and DEF of all Insect and Plant-Type monsters on your side of the field by 300. In addition, if you control no monsters on your side of the field during your Standby Phase, you may Special Summon 1 Level 4 or Level 1 Plant- or Insect-Type monster from your Deck in face-up Attack Position and take damage equal to its ATK.

Extreme Overgrowth
Normal Trap Card
Negate the next attack during this turn. Then, Special Summon 1 “Overgrowth Token” (Earth/Plant/1/0/?) with DEF equal to the ATK of the monster whose attack was negated.

Poison Thornbush
Continuous Trap Card
When you take Battle Damage while you control 1 or less monsters, you may pay 1000 Life Points to Special Summon 1 Level 5 or lower Insect- or Plant-Type monster from your Deck. This effect can only be activated once per turn and the effect of that monster cannot be activated that turn.[/spoiler]

[Zeppeli Gyro Supreme]

Would like at least SOME feedback on these cards before the move.