"Do not go there, do not go / unless you rise on wings, unless you walk on hooves."
—"Song to the Sun," Femeref song

The List

Sacred Mesa

At the beginning of your upkeep, sacrifice Sacred Mesa unless you sacrifice a Pegasus.
{1}{W}: Create a 1/1 white Pegasus creature token with flying.

Commander 2014

At the beginning of your upkeep, sacrifice Sacred Mesa unless you sacrifice a Pegasus.
{1}{W}: Put a 1/1 white Pegasus creature token with flying onto the battlefield.

Time Spiral Timeshifted

At the beginning of your upkeep, sacrifice Sacred Mesa unless you sacrifice a Pegasus.
{1}{W}: Put a 1/1 white Pegasus creature token with flying into play.

Anthologies

Mirage

During your upkeep, sacrifice a Pegasus or bury Sacred Mesa.
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W Put a Wild Pegasus token into play. Treat this token as a 1/1 white creature with flying that counts as a Pegasus.