Oracle

Sorcery 

Target creature an opponent controls blocks this turn if able. Untap that creature. Other creatures that player controls can't block this turn.

Tournooi-info

Legal in: Vintage, Legacy, Modern, Commander

Officiele rulings

1/24/2013
That creature’s controller still decides which attacking creature it blocks.

1/24/2013
If the creature can’t block (perhaps because it has become tapped or it doesn’t have flying and all attacking creatures do), then the requirement to block does nothing.

1/24/2013
If there are any costs required for that creature to block (such as the one imposed by War Cadence), the creature’s controller isn’t required to pay those costs. In that case, the requirement to block would do nothing.

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