Lurrus of the Dream-Den (Serial Numbered) - March of the Machine: Multiverse Legends (MUL)

Companion — Each permanent card in your starting deck has mana value 2 or less. (If this card is your chosen companion, you may put it into your hand from outside the game for 3 as a sorcery.)
Lifelink
Once during each of your turns, you may cast a permanent spell with mana value 2 or less from your graveyard.