Might want to have it as "leaves play" instead of being put back into a graveyard, just to stop combo silliness.
You think? Can you give me any examples?
I came up with another card:
Undying Councilor

Creature – Zombie Advisor
3/2
When Undying Councilor comes into play, you draw X cards and you lose X life, where X is the number of Zombies you control.
Reanimate
(You may play this card from your graveyard for its reanimate cost. If you do, it comes into play with a death counter on it. If this creature is put into a graveyard from play and has a death counter on it, remove it from the game.)Do you think it's too similar to
Graveborn Muse?
And another card:
Dead Rouser


Creature – Wizard
2/2

,

: Target creature card in your graveyard has reanimate until end of turn. Its reanimate cost becomes equal to its mana cost as you play it.
(You may play that card from your graveyard for its reanimate cost. If you do, it comes into play with a death counter on it. If that creature is put into a graveyard from play and has a death counter on it, remove it from the game.)