The biggest question is whether this is truly a one-time event or if players can eventually grab Lapras ex either through Pack Points or through another future event
Any other land that fetches another land can be used without limitation (including Krosan Verge, Terminal Moraine, Terramorphic Expanse, Evolving Wilds, Myriad Landscape, Flood Plain, Bad River, Rocky Tar Pit, Mountain Valley, Grasslands, Bant Panorama, Esper Panorama, Grixis Panorama, Jund Panorama and Naya Panorama)
Typically in a "Bystial"-focused Deck, the Level 6 "Bystial" monsters also serve as tributes for the higher Level members of the theme, "The Bystial Lubellion" and "The Bystial Alba Los"
Excluding starters and Synchron cards, I have kept the cards I don't want to draw naturally to just "Crossroad Runner" and "Synchro Rumble"
If this card destroys an opponent's monster by battle and sends it to the GY: This card gains 300 ATK