Vanilla

"Vanilla" is a slang term that refers to creatures with no rules text (e.g. Scathe Zombies).

Variants
"Vanilla flyer" is a creature with nothing but flying.

"French vanilla" refers to creatures that only have keyword abilities (e.g. Akrasan Squire).

"Virtual vanilla" refers to creatures that are essentially vanilla after the first turn they enter the battlefield (e.g. Augur of Bolas).

"Virtual french vanilla" refers to creatures that are essentially French vanilla after the first turn they enter the battlefield (e.g. Armada Wurm).

Trivia

 * Muraganda Petroglyphs and Ruxa, Patient Professor are the only cards that rewards vanilla creatures for having no abilities.