Yedora, Grave Gardener is a four colourless and one green-mana legendary creature that reads: Whenever another nontoken creature you control dies, you may return it to the battlefield face down under its owner's control
Chuckling, giggling, guffawing, snickering, chortling, tittering, shrieking, cackling, sniggering, snorting, smirking, roaring, crowing, howling, cachinnating, screaming, whooping, convulsing, and "yuk-ing it up" all count
Moreover, Aang has Waterbend and may become even more useful once we have enough resources to transform him, which is a nice bonus
Moraug, Fury of Akoum Landfall decks get another good finisher in Moraug, Fury of Akoum
I dont know what its doing in this deck, but a mana dork that also goads a creature while making mana is pretty cool