Speaking of your collection, the best place in North America to find new cards is at Danireon
The back face doesn't have a mana cost, but its mana value is based on the mana cost of the front face
Just make sure you don't accidentally hit a hand trap you intend on using yourself next turn
So naturally, well include multiple cards with strong effects that force you to deramp
(only once per turn) These shared effects simulates "Danger!" monsters revealing themselves in the wilderness (i.e.: in their owner's hand), going back into "hiding", and prompting the opponent try to "catch" the monsters (i.e.: correctly discarding the monster from the hand)
1999 One Piece Carddass Hyper Battle - First Stage - Luffy Pirates S01 (Special/Foil) The S01 "Luffy Pirates" (Straw Hat Crew) was the very first Reverse cardfeaturing Luffy, Nami, and Zoros first united appearanceand has a total PSA population of 28, with just 11 achieving Gem Mint 10