Mystery Booster 2

Creature — Kithkin Rogue

Plainswalk
Planeswalkerwalk (This creature can't be blocked as long as defending player controls a planeswalker.)
Whenever Plain Walker deals combat damage to a player or planeswalker, planeswalk. (If you're playing Planechase, proceed to the next plane.)

Plain Walker

The List (Unfinity Foil Edition)

Summon — Dinosaur

Phasing, cumulative upkeep {1}, echo {G}{G}, fading 3, bands with other Dinosaurs, protection from Homarids, snow-covered plainswalk, flanking, rampage 2

Old Fogey

The List

Creature — 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.

Graceful Antelope

Creature — Goblin Rogue

Plainswalk (This creature can't be blocked as long as defending player controls a Plains.)
{2}{R}, Sacrifice this creature: Destroy target Scarecrow or Plains.

Boggart Arsonists

Portal Three Kingdoms

Creature — Bird

Plainswalk (This creature can't be blocked as long as defending player controls a Plains.)