What are the weaknesses and retreat cost of this Arbok card
Muldrotha, the Gravetide, Meren of Clan Nel Toth, Wilhelt, the Rotcleaver, Kess, Dissident Mage, and Osgir, the Reconstructor are five of the top thirty you want to fill your graveyard
The cost is 1R, but players have to sacrifice Furnace Skullbomb too, which costs one mana of any color to put on the battlefield
If we cast and +2 a Nahiri, the Harbinger, on the next turn cycle, we can +2 again and use Glorious End to make our opponent skip their turn
Dualcaster Mage is the easier card to go infinite with, since it doesn't require being cast to copy spells like Ghostly Flicker, though the otters still great as just a body that doubles up on another spell you're casting
Once the planeswalker lands, you might cast more colorless spells to add more removal, but its plenty good to just kill a threat so Ugin sits around drawing cards