Steadfast Unicorn is a common Creature — Unicorn card from Commander Legends: Battle for Baldur's Gate (CLB), collector number 44. Current market price: $0.15 (foil $0.28), TCGplayer market prices via Scryfall.
{3}{W}: Creatures you control get +1/+1 and gain vigilance until end of turn. Activate only during your turn. (Attacking doesn't cause them to tap.)
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