CardName: Torpor Snail
Cost: 1WW
Type: Creature - Beast
Pow/Tgh: 1/1
Rules Text: Vanishing 3 (This permanent comes into play with 3 time
counters on it. At the beginning of your upkeep, remove a
time counter from it. When the last is removed, sacrifice
it.)
Other creatures lose all abilities and enter the battlefield
tapped.
Flavour Text:
Set/Rarity: Time Rare
Torpor Snail
R
Creature – Beast
Vanishing 3 (This permanent comes into play with 3 time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.) Other creatures lose all abilities and enter the battlefield tapped.
The delay fits nicely into a time theme.
I personally would apply the creature type Slug to all gatropods.