Urborg, Tomb of Yawgmoth + Yavimaya, Cradle of Growth Urborg, Tomb of Yawgmoth and Yavimaya, Cradle of Growth occupy a similar space of making all lands duals of a sort
After all, not everyone has almost $1000 laying around just to spend on a single card, even if it is exceptional
8 Animal Sanctuary There's finally a reason to cram all the best Dogs, Cats, Goats, Oxes, Birds, and Snake creature cards into one deck: Animal Sanctuary
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as an overload cost), add any cost increases, then apply any cost reductions
They spend a good chunk of the game catching frogs in Qu's Marsh (there's even a golden frog sidequest), while their main battle ability is actually "Eat" - consuming weakened enemies to learn Blue Magic (enemy skills)