Recur one creature to your hand Turn seven -- Bring back all dead lands to the battlefield, and shuffle that 'yard back
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When Genex Undine is normal summoned, players can send a Water attribute monster to the GY , which sets up follow-up combos with amazing GY effects later in the game
The 1999 promotion offered solid plastic Pokemon cards made to look as if they were made of golden plates, making them have a very recognizable look
some of these, to my knowledge, need some minor rewording to be a bit less clunky to read but other than that i'm really into the different effects and gimmicks, if you wanted to dip your toes into alchemy a bit I'd suggest a platinum as a potential boss monster (since you already used silver, the metal of the moon), either as a fusion of gold and silver (the alchemical symbol for platinum is literally just the gold and silver symbols next to each other because it was believed to be a composite of the two) or a rank 3/4 Xyz, possibly one with a sort of reverse gemini effect that makes it a normal monster when it runs out of materials, maybe a level 1/2 "moonfang ore pup" that can SS one of the others either on death or by self sacing
The cards themselves are available from WotC directly, and some of them include codes for Arena versions of the same cards