獄雕惡魔Hellcarver Demon的功能 - 魔法風雲會

請問一下

Hellcarver Demon 3BBB
Flying
Whenever Hellcarver Demon deals combat damage to a player,
sacrifice all other permanents you control and discard
your hand. Exile the top six cards of your library.
You may cast any number of nonland cards exiled this way
without paying their mana costs.

這些被移出遊戲的牌是隨時可以使用?
還是觸發的瞬間就要使用完?

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