Keyword: Companion

Companion — Your starting deck contains at least twenty cards more than the minimum deck size. (If this card is your chosen companion, you may put it into your hand from outside the game for any time you could cast a sorcery.)
Flying
When Yorion enters the battlefield, exile any number of other nonland permanents you own and control. Return those cards to the battlefield at the beginning of the next end step.

Companion — Each creature card in your starting deck is a Cat, Elemental, Nightmare, Dinosaur, or Beast card. (If this card is your chosen companion, you may put it into your hand from outside the game for any time you could cast a sorcery.)
Vigilance
Each other creature you control that’s a Cat, Elemental, Nightmare, Dinosaur, or Beast gets +1/+1 and has vigilance.

Companion — No card in your starting deck has more than one of the same mana symbol in its mana cost. (If this card is your chosen companion, you may put it into your hand from outside the game for any time you could cast a sorcery.)
: Add . This mana can’t be spent to pay generic mana costs.

Companion — Each nonland card in your starting deck shares a card type. (If this card is your chosen companion, you may put it into your hand from outside the game for any time you could cast a sorcery.)
As Umori, the Collector enters the battlefield, choose a card type.
Spells you cast of the chosen type cost less to cast.

Companion — Each permanent card in your starting deck has an activated ability. (If this card is your chosen companion, you may put it into your hand from outside the game for any time you could cast a sorcery.)
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.

Companion — Your starting deck contains only cards with converted mana cost 3 or greater and land cards. (If this card is your chosen companion, you may put it into your hand from outside the game for any time you could cast a sorcery.)
When Keruga, the Macrosage enters the battlefield, draw a card for each other permanent you control with converted mana cost 3 or greater.

Companion — Each permanent card in your starting deck has converted mana cost 2 or less. (If this card is your chosen companion, you may put it into your hand from outside the game for any time you could cast a sorcery.)
Lifelink
During each of your turns, you may cast one permanent spell with converted mana cost 2 or less from your graveyard.

Companion — Each nonland card in your starting deck has a different name. (If this card is your chosen companion, you may put it into your hand from outside the game for any time you could cast a sorcery.)
Flash
When Lutri, the Spellchaser enters the battlefield, if you cast it, copy target instant or sorcery spell you control. You may choose new targets for the copy.

Companion — Your starting deck contains only cards with even converted mana costs. (If this card is your chosen companion, you may put it into your hand from outside the game for any time you could cast a sorcery.)
When Gyruda enters the battlefield, each player mills four cards. Put a creature card with an even converted mana cost from among the milled cards onto the battlefield under your control.

Companion — Your starting deck contains only cards with converted mana cost 3 or greater and land cards. (If this card is your chosen companion, you may put it into your hand from outside the game for any time you could cast a sorcery.)
When Keruga, the Macrosage enters the battlefield, draw a card for each other permanent you control with converted mana cost 3 or greater.

Companion — Your starting deck contains only cards with odd converted mana costs and land cards. (If this card is your chosen companion, you may put it into your hand from outside the game for any time you could cast a sorcery.)
If a source you control with an odd converted mana cost would deal damage to a permanent or player, it deals double that damage to that permanent or player instead.

Companion — Your starting deck contains only cards with even converted mana costs. (If this card is your chosen companion, you may put it into your hand from outside the game for any time you could cast a sorcery.)
When Gyruda enters the battlefield, each player mills four cards. Put a creature card with an even converted mana cost from among the milled cards onto the battlefield under your control.

Companion — Each nonland card in your starting deck shares a card type. (If this card is your chosen companion, you may put it into your hand from outside the game for any time you could cast a sorcery.)
As Umori, the Collector enters the battlefield, choose a card type.
Spells you cast of the chosen type cost less to cast.