Nezuko, Demon Chosen

Companion — Your starting deck contains only
cards with odd mana values and land cards. (If
this card is your chosen companion, you may put it
into your hand from outside the game for {3} as a
sorcery.)
If a source you control with an odd mana value
would deal damage to a permenant or player, it
deals double that damage to that permenant or
player instead.