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Because this effect is a mandatory Trigger Effect, you cannot "miss the timing" with it. So even if you send "Roc from the Valley of Haze" to the Graveyard as a cost, or in the middle of a chain, it will still return to your hand (after resolving the current series of events).
Because this effect is a mandatory Trigger Effect, you cannot miss the timing with it.
Because this effect is a mandatory Trigger Effect, you cannot "miss the timing" with it. So even if you send "Roc from the Valley of Haze" to the Graveyard as a cost, or in the middle of a chain, it will still be shuffled into your Deck (after resolving the current series of events).
So even if you send Roc from the Valley of Haze to the GY as a cost, or in the middle of a chain, it will still be shuffled into your Deck (after resolving the current series of events).