Netherhoof Unicorn

Submerge (When this creature enters the battlefield,
you may put a -1/-1 counter on it. If you do, it becomes
submerged and it can't be blocked.)
Whenever Netherhoof Unicorn deals combat
damage to an opponent, that player discards a
card unless they pay {2}.
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"It might been born in the light, but it walks in shadow
now."- Megliana, Saint Sword