"Trying to stop it would be foolish. If you feel it coming—run!"
—Sergeant Ryda

Seismic Elemental

When Seismic Elemental enters, creatures without flying can't block this turn.

Jumpstart

Game Night

When Seismic Elemental enters the battlefield, creatures without flying can't block this turn.

Magic Origins

No creature without flying will be able to block that turn, including creatures that lose flying after Seismic Elemental’s ability resolves and creatures without flying that enter the battlefield after that ability resolves.