Insidious Chill (Blue)

This enters the arena with 3 frost counters on it. When it has no frost counters, destroy it.

Whenever you Ice Fuse, remove a frost counter from this. If you do, target hero discards a card unless they pay

Rulings

From the Uprising release notes

Fusing with more than an ice card will still trigger Insidious Chill, as long as an ice card is used to fuse.
The triggered effect of Insidious Chill resolves before the card with Ice fusion resolves.
If the target hero has no cards in hand they can still elect to discard a card instead of paying .
This is not a optional effect. Insidious Chill triggers each time you Ice fuse.
This is not a once per turn effect. Insidious Chill triggers each time you Ice fuse, even in a single turn.
Insidious Chill is destroyed as a triggered effect when it does not have Ice counters on it.
You cannot respond to your own Ice Fuse with another Ice Fuse to gain the Insidious Chill effect if it does not have any frost counters left.