"We could see the horizon blacken with the great beasts, but it was too late. The icefield offered no immediate safety, but luckily most of us reached a crevasse in which we could take cover."
—Disa the Restless, journal entry

Masters Edition II

Stampede

Attacking creatures get +1/+0 and gain trample until end of turn.

"When are beasts like a river?"
—*The One Thousand Questions*

Fifth Edition

All attacking creatures get +1/+0 and gain trample until end of turn.

Ice Age

All attacking creatures gain trample and get +1/+0 until end of turn.