Paying that one-time cost protects you against any number of future harms, and you get to choose when you pay it instead of needing to always have mana ready in case your opponent acts
While Devour Intellect is only a Thoughtseize if we cast it using mana from a Treasure token, this isn't really that difficult thanks to cards like Deadly Dispute and Skullport Merchant
She is more adept at making potions in Shadowmoor, though their effects are even more chaotic and deadly
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Nessian Wanderer, Sythis, Harvest's Hand, Courser of Kruphix, Mesa Enchantress, Satyr Enchanter, Setessan Champion, Verduran Enchantress, Eidolon of Blossoms, Narci, Fable Singer, Calix, Destiny's Hand, Enchantress's Presence, Love Song of Night and Day 12 card draw
These proxies are intended for casual play, deck testing, and collecting