Oracle

Instant 

Bolster 4. (Choose a creature with the least toughness among creatures you control and put four +1/+1 counters on it.)

Tournooi-info

Legal in: Vintage, Legacy, Modern, Commander

Officiele rulings

2/25/2015
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 Aven Tactician’s bolster ability.

2/25/2015
You determine which creature to put counters on as the spell or ability that instructs you to bolster resolves. That could be the creature with the bolster ability, if it’s still under your control and has the least toughness.

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