Void Hatchling

For each opponent's main deck, look at its current top card and choose whether to recycle it, then reveal the card now on top.

Void Hatchling replaces Drakehound Packmaster's reveal instruction with that sequence.^370.1.b If Drakehound Packmaster reveals from several opponents' decks at once, each deck's reveal is treated separately for replacement effects.³⁷³ One Void Hatchling can apply across all of those events in the same replacement sequence.^373.2

Drakehound Packmaster then continues with the cards it revealed.

For each opponent's main deck, apply the three replacement effects one at a time, making three separate look-and-recycle choices before revealing the card currently on top.

Each replacement changes Drakehound Packmaster's reveal into a look at the current top card, an optional recycle, and another reveal.^370.1.b When several replacement effects apply, they are ordered and applied one at a time.³⁷² After one copy applies, it cannot apply again to the original reveal or any event that replaced it.^370.2 The reveal created by that copy can still be replaced by another copy, so all three apply in sequence.^370.1.b370.2 If Drakehound Packmaster reveals from several opponents' decks at once, each deck's reveal is treated separately.³⁷³ Each Void Hatchling can apply across all of those events in one replacement sequence.^373.2

Each time, look only at the current top card and choose whether to recycle it. If you leave it on top, the next replacement looks at the same card; if you recycle it, the next replacement looks at the new top card. You never look at more than one card at a time or reorder any cards left on top.

After the third replacement, reveal the current top card and continue Drakehound Packmaster's instructions normally.