Merieke Ri Berit doesn't untap during your untap step. {T}: Gain control of target creature for as long as you control Merieke Ri Berit. When Merieke Ri Berit leaves the battlefield or becomes untapped, destroy that creature. It can't be regenerated.

As an additional cost to cast this spell, discard X cards. Look at target opponent's hand and choose X cards from it. That player discards those cards.

({T}: Add {B}.)

{T}: Add {C}{C}.