Leoni, Kissed By Ice

Frost touch, Thorns 2 (Whenever this creature is dealt combat damage by creature, this creature deals 2 damage to that creature.)
Sacrifice a legendary artifact : If this creature isn't an Elemental, put two +1/+1 counters on it, then it becomes an Elemental and gains flying and Aegis 2.(This effect lasts indefinitely.)
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"Only the past can set her free ."