If the Jeskai route makes the most sense, a 1/1 that should immediately gain you life, and be expendable at the same time fits nicely is a battalion setting
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Grants that creature lifelink temporarily, allowing you to gain life equal to damage dealt
Its not amazing by any means, but its a fine addition
Newer titles have moved away from the paradigm of the heroes of light collecting the scattered crystals in favor of broader, more convoluted plot-lines, but most games in the series still have a crystalline element somewhere