This card is a bit situational because all five pieces of Exodia need to be in the Graveyard or you will lose your Exodia Necross, but the longer this card stays on the field, the bigger it gets by gaining 500 ATK every turn, letting you stall enough to bring back the pieces to your hand.
Of course, with Master Rule 5 on its way in April that wont be as big of a deal, but for the next month, its going to slow things down without some extra help from cards like Cross-Sheep
Despite being a mono-green list, Delighted Halfling and Birds of Paradise are still making the cut simply on the off-chance that your opponent's cast a spell that requires you to have differently-colored mana, and they're both at least as good as the Llanowar / Fyndhorn / Elvish Mystic trio
The only downside with this card is that you want to have a significant number of hits for both types
Are cards with augment considered creature cards
What attacks does Pumpkaboo have