Figured I'd list out all the world magic and what they look like for ease of reference. Ordered left to right on the UI (if only things were WUBRG...)

===Active Use - Risks an amulet every use===

Black - Deck with Cards Being Drawn - Conjurer's Will - 400g Edit deck out in the open

Blue - Jumping Guy - Leap of Fate - 300g Teleport to random location

Green - Winged Sandals - Quickening - 300g Double your land speed

Red - Magic Staff - Thunderstaff - 500g Kill the closest creature

White - Sword - Sword of Resistance - 400g Teleport to a town under siege

====Always On====

Deck Being Shuffled - Slight of Hand - 500g Switch Ante once before duel

Stack of Gold Coins - Haggler's Coin - 500g Increases number of cards sold in Towns/Villages

Dragonfly - Amulet of Swampwalk - 150g Move faster in swamps

Spellbook - Tome of Knowledge - 400g Increases amount of duplicates allowed for each card by one

Carved Apple - Fruit of Sustenance - 300g Gain food in forests

Pickaxe - Dwarven Pick - 150g Move faster in mountains

Ruby Ring - Ring of the Guardian - 600g Wizards need to capture 5 towns/villages to win

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If you stumble on them, Pickaxe and Dragonfly are super useful and cheap (150g)

I've played around with Leap of Fate and Quickening also. They can be useful while playing Hide-N-Seek with the Castles