Although white has always been good at dealing with creatures efficiently, with cards such as Swords to Plowshares, Path to Exile and Terminus, noncreature permanents have always been an issue
Emergency graveyard removal at this cost and speed is great
Going off power rather than CMC makes Mentor of the Meek far easier to activate, despite being stricter
The History of Modular in MTG Mark Rosewater designed modular to be reminiscent of the spike creatures from Exodus and the chimeras of Visions
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In a pinch, Thalia can fight as a 2/1 with first strike, but players mostly use Thalia for her ability, and if one Thalia is killed off, another may be cast for cheap