Advent of Atlantis

“This card's name becomes "Umi" while in the Spell & Trap Zone. You can only use each of the following effects of "Advent of Atlantis" once per turn. During your Main Phase: You can place 1 "Atlantis, City of the Sea Dragon" or "Umi" from your Deck, face-up in your Field Zone. If this card is sent to the GY: You can add 1 Level 7 Sea Serpent monster from your Deck to your hand.”