Oracle

Sorcery 

Target creature gets +3/+3 until end of turn. All creatures able to block it this turn do so.

Tournooi-info

Legal in: Vintage, Legacy, Modern, Commander

Officiele rulings

7/13/2018
If a creature the defending player controls can’t block the target creature for any reason (such as being tapped), then it doesn’t block that creature. If there’s a cost associated with having a creature block the attacking creature, the defending player isn’t forced to pay that cost, so it doesn’t have to block in that case either.

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