Deep Freeze allows you to choose two characters that you exert

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It is a terrifying power. Jace Beleren Illustrated by Bastien L
Mechanically, they could move counters between other creatures that represent their parasitic larvae, and perhaps have healing or protective effects on the "host" creature - unless the host is black-aligned
Only Blue and Black can answer it, even though it's enchantment nature should make it eligible for destruction by colors that destroy enchantments
Unlike Adventures, however, you dont get the best of both worlds since the card is shuffled away after playing