When the card Avatar Destiny was attached to an animated land (enchanting a creature-land), the land was subsequently put into the graveyard. Under normal rules, the triggered ability of Avatar Destiny should have resolved—allowing me to mill cards, return a card from my graveyard to hand, and return Avatar Destiny itself to my hand.

However, due to the earthbend ability triggering as the land died, the land was returned directly to the battlefield. This appears to have interfered with the game's ability resolution, causing Avatar Destiny’s triggered ability to fail to resolve entirely.