how do double sided mtg cards work

how do double sided mtg cards work double-sided in Magic the Gathering gameplay? Double sided card help :

Name: how do double sided mtg cards work double-sided in Magic the Gathering gameplay? Double sided card help :
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1 Slave of Bolas

Urzas Cave This Urzas land tags out into a different land at some point during the game, making it one of the most universally accessible ways to find a specific land

Mushu tells us players wanted clean ways to close without jumping into narrow combos

I know the troubles Vivi Ornitier causes (especially when paired with Agathas Cauldron), but I wouldnt be playing Magic in 2025 if it werent for the Final Fantasy set