With the new update came a card pack, the Ninja's Lore Pack, that has a rare chance at gaining the card, along with other ones as well. You can read about it at these links:
http://www.wizard101central.com/wiki/Item:Ninja%27s_Lore_Pack
https://www.wizard101.com/game/ninja-lore-game-card-pack
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all you need to do is by it at right aid or 7 11 stores for 20 $
mammal and mud = pig
You can't. That is only on Minecraft Animations. But there is a Pig Companion mod where you can tame a pig and put a helmet on it.
No, unfortunately not. If you kill the pig, the saddle disappears.
You can't. There is no pig in Harvest Moon A Wonderful Life.