So basically, Chains punishes players who try to draw lots of cards by keeping cards constantly flowing in and out of players hands, or into the graveyard
You have to use this ability responsibility since Niv can easily turn himself into a huge target for your opponents making him a sponge for all removal spells your opponents might have
Pictured above in the 1,600 ct
Forged in Stone Part of the conceit of this product was introducing planeswalker cards for characters assumed to be dead within the narrative
Yes, Sigil of the Nayan Gods is a key card in 2 combo(s) in our combo database, linked from the Combos section of this page
However, if you want to complete your collection, you might as well pick one copy up from Ursula's Return