They want to draw more cards, so theyll be tempted to leave your Nekusar alive
If the Ugin's Nexus that remains on the battlefield isn't on the battlefield when each of those extra turns would begin, you can take those turns.
While slightly more difficult to cast early on than other discard cards because of its two colors of mana, Thought Erasure can pull anything from your opponents hand, which is helpful against just about every deck
The Pokemon Trading Card Game is a pretty straightforward game, but if you look up on the internet, youll probably end up reading some complicated guide which is enough to make you give up on the game even before trying
For instance, you could get Strefan, Maurer Progenitor in an extended-art version
You just can't ignore the power of Arcane Signet's cheap ramp