Zhalfirin Decoy

{T}: Tap target creature. Activate only if you had a creature enter the battlefield under your control this turn.

Jumpstart: Historic Horizons

"Never let them take their eyes off you."
—Sidar Jabari

Modern Horizons

{T}: Tap target creature. Activate this ability only if you had a creature enter the battlefield under your control this turn.

Zhalfirin Decoy’s ability can be activated even if a creature entered the battlefield under your control only before Zhalfirin Decoy entered the battlefield, and even if that creature has left the battlefield.