The fact you can make it a Day of Judgment, if you like, is actually pretty useful
4 loyalty Player 2 - During his or her upkeep, Player 1 uses Teferi, Master of Time to use its first ability to +1 and Loot
Mixed Bag Those are the big groups of cards I have definite ideas for, though there are a number of other cards that get the gears turning
If a permanent entering the battlefield at the same time as Elesh Norn (including Elesh Norn itself) causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time
He's just a 1/1, but he also only costs 1 black mana
(The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.) Creature - Human Ooze Germination Practicum Put two +1/+1 counters on each creature you control