Im looking at a series of Weather cards. Each one is a Permanent, but only one can be in play at any time. Most recent one played is in effect. They can't be stolen or destroyed, so immaterial, but playing a new one cancels out the old one and it is discarded.
Some might have counters or a duration. Some might be able to coexist, but probably not.
Several will alter creatures or cause creatures to change.

- I have no idea yet

- High Winds? flying creatures have trouble?

- hmmm?

- Fog of Some kind to slow down attackers? Acid Rain?

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- Heat Wave, wears down creatures? Maybe causes delay like sundial?

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- Gentle Rains, creatures regenerate 1 HP per turn

- Clear Skies, flying creatures get +1 Att

- Sand Storm, delay? Burrow creatures?

- Snow Storm | Ice Storm, Flooded Tiles are frozen, weak/non-flyers cant attack, scorpions cant attack
Looks like several would cause delay, probably to certain classes of creatures for a few rounds.