"Ever seen a changeling fly into a lantern?"
—Calydd, kithkin farmer

Mothdust Changeling

Changeling (This card is every creature type.)
Tap an untapped creature you control: This creature gains flying until end of turn.

The List

Modern Masters

Changeling (This card is every creature type at all times.)
Tap an untapped creature you control: Mothdust Changeling gains flying until end of turn.

Morningtide

Since the activated ability doesn't have a tap symbol in its cost, you can tap a creature (including Mothdust Changeling itself) that hasn't been under your control since your most recent turn began to pay the cost.