yugioh terrain cards Yu-Gi-Oh! - Wetlands (LODT-EN054) - Light of Destruction - Unlimited Edition JUNK URSINO | Another few

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The question if it was ever intended to be included in packs is not completely clear, but the discovery of E4 member styluspt that the cards was actually advertised to be in the set in a Japanese Trainers Magazine as well as on early concept designs of Jungle booster packs certainly makes this appear likely (see PIKACHU 1ST ED JUNGLE BLACK STAR PROMO - WAS IT INTENTIONAL

Discover shows up on 26 cards in The Lost Caverns of Ixalan , if you include the Human Artificer, Curator of Sun's Creation

If this card leaves the field: You can target up to 2 Level/Rank 2 or lower monsters in your Graveyard