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Border Guardian (140) [Unstable]
$0.35
Unstable
Artifact Creature — Knight
uncommon
{4}
Whenever you cast a silver-bordered spell, put a +1/+1 counter on this creature.
Whenever you cast a black-bordered spell, this creature can't be blocked this turn.
Whenever you cast a white-bordered spell, this creature gains double strike until end of turn.