Do You Hear What I Hear?

Whenever an opponent casts a spell during your
turn or that targets a permanent you control,
create X 2/2 red gremlin creature tokens. X is
equal to the converted mana cost of that spell.
Whenever a gremlin you control deals combat
damage to player, you may destroy target artifact
they control or gain control of target vehicle they control.
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"It's going be anything but a silent night."