The card reads: You may choose an artifact or creature card with mana value 1 you discarded this way, then do the same for artifact or creature cards with mana values 2 and 3. In the right decks, you basically get to pay four mana to draw some cards and put six manas worth of cards into play
So, the way these cards are in their foil, they were just never printed like this
Ten gates were released with that Magic set, one for each of the 10 Ravnican guilds (Izzet Guildgate, Orzhov Guildgate, and Simic Guildgate, and so on for each color pair), each of which enters the battlefield tapped and taps for 1 mana of either of the guild's colors
However, like all collectible goods, the value of Pokemon cards can be found by averaging recently sold items prices