What does Join forces do in MTG?

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

What is the best Join forces card?

By popularity, Minds Aglow is among the most-played Join forces cards — see the full ranked list above.

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

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