Armor-clad Chillkyn

Freezing 1 (When this creature attacks, tap 1
creature the defending player controls.)
If you cast this spell using only snow lands, it
has haste, hexproof, and enters the battlefield
with a +1/+1 counter.
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When a corpse is reanimated as a chillkyn, its bones
will grow and rip through its skin in growths reminiscent of horns.