Ghalta, Stampede Tyrant [The Lost Caverns of Ixalan Prerelease Cards] Criatura search your library for a

search your library for a colorless creature card

they'll actually tell you it

"The new prototype utilizing a rotational axis is marvelously effective: it makes me want to tear my own ears off

And it turns out

proposal for overeseer prototype

Ghalta, Stampede Tyrant [The Lost Caverns of Ixalan Prerelease Cards] Criatura search your library for aSet: The Lost Caverns of Ixalan Prerelease Cards Type: Legendary Creature Elder Dinosaur Rarity: Mythic Cost: {5}{G}{G}{G} Trample When Ghalta, Stampede Tyrant enters the battlefield, put any number of creature cards from your hand onto the battlefield. A thundering roar calls forth a primeval army.