What does Backup do in MTG?

Backup is an official Magic: The Gathering keyword. The ranked cards above show how it works in practice.

What is the best Backup card?

By popularity, Backup is among the most-played Backup cards — see the full ranked list above.

Backup is a Magic: The Gathering keyword. Below are the best Backup cards of all time, ranked by popularity.

What does Backup do in MTG?: Backup is an official Magic: The Gathering keyword. The ranked cards above show how it works in practice.
What is the best Backup card?: By popularity, Backup is among the most-played Backup cards — see the full ranked list above.