Zirda, the Dawnwaker
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Companion — Each permanent card in your starting deck has an activated ability.
Abilities you activate that aren't mana abilities cost 
less to activate. This effect can't reduce the mana in that cost to less than one mana.
, 
: Target creature can't block this turn.
3/3
Illustrated by Jesper Ejsing
Rulings (17)
Apr 17, 2020
Activated abilities contain a colon. They're generally written "[Cost]: [Effect]." Some keyword abilities are activated abilities (such as cycling) and will have colons in their reminder text.
Apr 17, 2020
Activating Zirda's last ability after a creature has blocked won't remove the blocking creature from combat or cause the creature it blocked to become unblocked.
Apr 17, 2020
An activated mana ability is one that produces mana as it resolves, not one that costs mana to activate.
Apr 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.
Apr 17, 2020
Effects that reduce the generic mana cost of an activation cost can't reduce that cost's colored mana requirements. The activation cost is reduced by only if doing so reduces that cost to one mana. For example, a cycling cost of would become , and one of 
would become . The activation cost is unaffected if it already costs one or zero mana (such as the activation cost of Zirda's last ability).
Apr 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.
Apr 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.
Apr 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.
Apr 17, 2020
Permanent cards are artifact, creature, enchantment, land, and planeswalker cards. Land cards with basic land types have intrinsic activated mana abilities associated with those types.
Apr 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.
Apr 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.
Apr 17, 2020
The requirements of the companion ability apply only to your starting deck. They do not apply to your sideboard.
Apr 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.
Apr 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.
Jun 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.
Jun 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.
Jun 1, 2020
Wizards of the Coast has issued functional errata for the Companion mechanic. Instead of casting companions from outside the game: Once per game, any time you could cast a sorcery (during your main phase when the stack is empty), you can pay to put your companion from your sideboard into your hand. This is a special action, not an activated ability. It happens immediately and can't be responded to. It can't be countered or stopped by cards like Phyrexian Revoker. For more information please see https://magic.wizards.com/en/articles/archive/news/june-1-2020-banned-and-restricted-announcement
