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Yes, you can sell Pokmon cards on eBay

The first ability gives you a card each turn that you can cast from exile while the second ability rewards you for casting cards from exile with a Treasure token

2: Create a 1/1 blue Ninja creature token with "This token can't be blocked." 7: You get an emblem with "Whenever a creature you control deals combat damage to a player, search your library for a blue or black creature card, put it onto the battlefield, then shuffle." +1: Draw a card

For example, a space opera wants a lot of different types of aliens, and Magic is already filled with different kinds of creatures with varying abilities