Samite Alchemist is a common Creature — Human Cleric card from Homelands (HML), collector number 13a. Current market price: $0.09, TCGplayer market prices via Scryfall.
{W}{W}, {T}: Prevent the next 4 damage that would be dealt this turn to target creature you control. Tap that creature. It doesn't untap during your next untap step.