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Cast this spell only during the declare blockers step.
Target unblocked attacking creature becomes blocked. (This spell works on creatures that can't be blocked.)
Draw a card at the beginning of the next turn's upkeep.
Is not very useful against Trample creatures since Trample damage comes through as if a zero toughness creature blocked the Trampler.
Works on creatures that can’t be blocked and on creatures that have special blocking requirements.
