how do double sided mtg cards work

how do double sided mtg cards work I am 99% sure this is a card? But where I'm confused is what are the requirements to flip to the other side or can u cast either side freely DDR#148 - Modal Double-Faced Cards

Name: how do double sided mtg cards work I am 99% sure this is a card? But where I'm confused is what are the requirements to flip to the other side or can u cast either side freely DDR#148 - Modal Double-Faced Cards
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Description

Card Name Mana Cost Type Legendary Creature Human Mutant Scout Rarity Uncommon rules Text When Zidane enters, gain control of target creature an opponent controls until end of turn

It does generate a creature itself on entry, however, so its not all bad

Shoo, shoo! Keskit, the Flesh Sculptor Illustrated by Dave Kendall Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp