Hexerei
Kräftigung 3. (Lege drei +1/+1-Marken auf eine Kreatur mit der geringsten Widerstandskraft unter den Kreaturen, die du kontrollierst.)
Bolster itself doesn’t target any creature, though some spells and abilities that bolster may have other effects that target creatures. For example, you could put counters on a creature with protection from white with Abzan Skycaptain’s bolster ability.