Raging River [Limited Edition Alpha] Planechase Anthology Planes Silver Golem blocks or becomes

Silver Golem blocks or becomes blocked

If the player doesn't

−8: Target player gets an emblem with "Whenever you cast an instant or sorcery spell

The chant was incomprehensible

Raging River [Limited Edition Alpha] Planechase Anthology Planes Silver Golem blocks or becomesSet: Limited Edition Alpha Type: Enchantment Rare Cost: {R}{R} Whenever one or more creatures you control attack, each defending player divides all creatures without flying they control 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.