Border Guardian

Border Guardian

Artifact Creature - Knight | Power/Toughness: 1 / 1 (CMC 4)
Whenever you cast a silver-bordered spell, put a +1/+1 counter on Border Guardian.
Whenever you cast a black-bordered spell, Border Guardian can't be blocked this turn.
Whenever you cast a white-bordered spell, Border Guardian gains double strike until end of turn.
  • [UST] Unstable #140 (U)