Brionac, Dragon of the Ice Barrier (HAC1-EN051)

1 Tuner + 1+ non-Tuner monsters

You can discard any number of cards to the GY, then target the same number of cards your opponent controls; return those cards to the hand. You can only use this effect of "Brionac, Dragon of the Ice Barrier" once per turn.

Sea Serpent / Synchro / Effect, Hidden Arsenal: Chapter 1