| 6/1/2020 |
If you reveal a companion outside the game, for as long as it remains there, you may pay  any time you could cast a sorcery (that is, you have priority during your main phase and the stack is empty). Once you do, you put it into your hand and behaves like any other card you've brought into the game. For example, if it's discarded, countered, or destroyed, it's put into your graveyard, remaining in the game. This is a change from previous rules. |
| 6/1/2020 |
Paying to put your companion into your hand is a special action. It doesn't use the stack and players can't respond to it. Once you take this action, you may cast that card if it's legal to do so before any other player can take actions. |
| 4/17/2020 |
Jegantha's companion ability compares the exact symbols in the mana costs of cards in your deck. If any one card has the same symbol twice, such as   or  , the companion condition isn't satisfied. |
| 4/17/2020 |
A generic mana cost is usually represented by numeric mana symbols ( ,  , and so on) and also . It is any cost requiring mana where that cost isn't  ,  ,  ,  , , or  . |
| 4/17/2020 |
Your companion begins the game outside the game. In tournament play, this means your sideboard. In casual play, it's simply a card you own that's not in your starting deck. |
| 4/17/2020 |
Before shuffling your deck to become your library, you may reveal one card from outside the game to be your companion if your starting deck meets the requirements of the companion ability. You can't reveal more than one. It remains revealed outside the game as the game begins. |
| 4/17/2020 |
The requirements of the companion ability apply only to your starting deck. They do not apply to your sideboard. |
| 4/17/2020 |
If more than one player wishes to reveal a companion, the starting player does so first, and players proceed in turn order. Once a player has chosen not to reveal a companion, that player can't change their mind. |
| 4/17/2020 |
If you reveal a companion outside the game, for as long as it remains there, you may pay any time you could cast a sorcery (that is, you have priority during your main phase and the stack is empty). Once you do, you put it into your hand and behaves like any other card you've brought into the game. For example, if it's discard, countered, or destroyed, it's put into your graveyard, remaining in the game. This is a change from previous rules. |
| 4/17/2020 |
Paying to put your companion into your hand is a special action. It doesn't use the stack and players can't respond to it. Once you take this action, you may cast that card if it's legal to do so before any other player can take actions. |
| 4/17/2020 |
The companion's other abilities apply only if the creature is on the battlefield. They have no effect while the companion is outside the game. |
| 4/17/2020 |
The companion ability has no effect if the card is in your starting deck and creates no restriction on putting a card with a companion ability into your starting deck. For example, Zirda may be in your starting deck even if your other permanent cards don't all have activated abilities. |
| 4/17/2020 |
You may have one companion in the Commander variant. Your deck, including your commander, must meet its companion requirement. Your companion is not one of your one hundred cards. |
| 4/14/2023 |
You can spend mana from Jegantha's mana ability to pay for a hybrid symbol such as , but only if you choose to pay the colored mana component, not the generic mana component. |
|