Astarion's Thirst is a rare Instant card from Commander Legends: Battle for Baldur's Gate (CLB), collector number 570. Current market price: $2.80 (foil $2.49), TCGplayer market prices via Scryfall.
Exile target creature. Put X +1/+1 counters on a commander creature you control, where X is the power of the creature exiled this way.
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