Creature — Antelope
Graceful Antelope
Plainswalk (This creature can't be blocked as long as defending player controls a Plains.) Whenever this creature deals combat damage to a player, you may have target land become a Plains until this creature leaves the battlefield.
From Magic: The Gathering.
Exact printings
Open the interactive version on https://mythscribe.cloud/app/tcg/cards/cms6oh8shcd31pb1h41v10dql.