Gigi, Following Her Instincts

Haste

Whenever Gigi attacks, create a Makeup Token Artifact with "{2},{t} Sacrifice this artifact: Target creature becomes a copy of another creature you control until the end of turn".

In the beginning of your end step, if Gigi is a copy of another creature, exile the top card of your library, if it's a creature, create a token that's a copy of it in the battlefield, under your control.