Notion Thief, Orcish Bowmasters, Narset, Parter of Veils and Consecrated Sphinx all fall into this category
You can make a little combo by self-milling, activating unearth creatures from the graveyard, and ending the turn
Equip 2 If the equipped creature dealt combat damage only to a player or planeswalker, Thirsting Axes triggered ability triggers
If you are playing a deck built around something like delirium or dredge, you will want to mill yourself
This ability gives Terra ample fodder to scavenge the Graveyard to bring some powerful creatures onto the Battlefield which is even better given Celes secondary ability
But the Elvish Aberration will be used to grab the land I can drop on turn 3 for that Cultivate or cycled Krosan Tusker