Reito Umi (Anti-Umi/Ice-theme Field Spell)

[Taylor Gorrell]

Reito Umi (Translated: "Frozen Ocean")
Field Spell Card
This card can only be activated while either player controls a face-up "Umi". While this card is face-up, "Umi", "A Legendary Ocean", and "Forgotten Temple of the Deep" cannot be activated. Face-up Fish, Sea Serpent, Reptile, and Dinosaur-Type monsters lose 500 ATK and DEF. Raise the Level of all WATER monsters (except Spellcaster, Warrior, Aqua, and Dragon-Type monsters) in both players' hands and on the field by 1.

Made this up on a whim while thinking of my Ice Deck on Dueling Network. Spellcaster, Aqua, Warrior, and Dragon make up most ice-themed cards.

Discuss.

[Premier Alexander Romanov]

Sounds similar to those Mobius cards from GX.
But is Umi really used often enough for this to be practical?

[Taylor Gorrell]

You'd be surprised. Quite a few people still use A Legendary Ocean Decks, and ALO counts as Umi while active, so it can trigger Reito Umi. Maybe I should extend it so it can be activated while the field is treated as Umi as well (so Temple or Maiden of the Aqua can trigger it).