Shadow is a keyword ability.
The only creature that can legally block Augur il-Vec is Drifter il-Dal, as they both have shadow. The Grizzly Bears does not have shadow so it cannot.
Similarly the only creature that can legally block the Canyon Minotaur is the Grizzly Bears, as the Drifter il-Dal has shadow.
- 702.27a. Shadow is an evasion ability.
- 702.27b. A creature with shadow can't be blocked by creatures without shadow, and a creature without shadow can't be blocked by creatures with shadow.
- 702.27c. Multiple instances of shadow on the same creature are redundant.