The dragon gets delooped.
RB06-JP001 Red-Eyes Darkness Metal Dragon
Level 10 DARK Dragon Effect Monster
You can only Special Summon a card with this card’s name once per turn by the (1) effect, and can only use the (2) effect of this card’s name once per turn.
(1) You can Special Summon this card (from your hand) by banishing 1 face-up Dragon monster you control.
(2) During your Main Phase: You can Special Summon 1 Dragon monster from your hand or GY, except “Red-Eyes Darkness Metal Dragon”.