This card is supposed to get +1/+1 for every non-creature non-land card in your graveyard, but it's only getting +1/+1 for cards that ENTER the graveyard AFTER it's in play.

Steps to reproduce:

1. Play 2 instants or sorceries and have them in the graveyard
2. Play Xande
3. Note that it's still a 3/3, despite them being in your graveyard
4. Then play another instant or sorcery
5. Now it is a 4/4 (where it should really be a 6/6)
6. Win the match anyway because you opponent just keeps playing small cats! :-)