Mystica, Eternities' Treader

Companion — Each nonland card in your
starting deck has a converted mana cost that is
greater than 1 and is less than 6.
Flying, vigilance
Whenever another permanent you control is
put into a graveyard, return target permanent
card with converted mana cost equal to 1 less
than that permanent's converted mana cost
from your graveyard to the battlefield.