Raging River

Enchantment    (CMC:2)

When you attack, non-flying defending creatures must be divided as opponent wishes between the left and right sides of the River. You then choose on which side of the River to place each attacking creature, and attacking creatures can only be blocked by flying creatures or those on the same side of the River.

2E • ENSandra Everingham

™ & © 1993—1993 Wizards of the Coast

Legal in: Legacy,Vintage,Commander

Oracle Text (click to copy):

Raging River {R}{R} Enchantment Whenever one or more creatures you control attack, each defending player divides all creatures without flying he or she controls into a "left" pile and a "right" pile. Then, for each attacking creature you control, choose "left" or "right." That creature can't be blocked this combat except by creatures with flying and creatures in a pile with the chosen label.

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View this MTG card on Gatherer

5/1/2008
If a creature enters the battlefield (or something becomes a creature) after the ability resolves, that creature will not be able to block any creature that was attacking at the time the ability resolved.
5/1/2008
If a creature is put onto the battlefield attacking after the ability resolves, it can be blocked by any creature that could normally block it (including others creatures that entered the battlefield after the ability resolved).

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Card Raging River is not on TCGPlayer.