The card would have a curse score separate from its power, so a 1/1 creature could potentially have a curse 3 ability, putting three -1/-1 counters on blockers
One of its more unusual gimmicks, revealed in the stream, is a massive artwork depicting the Battle of the Pelennor Fields, split across 18 different Magic: The Gathering cards
If your Eye of Nidhogg-enchanted creature is killed in combat (or its hit with some targeted removal), you can thankfully return the aura from the graveyard and back into your hand
It ramps you unlike Oubliette by turning your Commander into a Land
Crackling Drake is super solid if you are playing in Izzet, and pushing out a potential 6/4 or 7/4 flyer for four mana is really good Enigma Drake is better, btw
End Phase Finally, theres the End Phase