I think Endless One could be fine in a deck that has a focus on the +1/+1 counters on your creatures with cards like Avatar of the Resolute, but as a big payoff spell, the other options are miles better
The best way to start off is by using all the resources you get to build one strong deck that you enjoy playing, then use that deck to win more games and slowly build up your collection
But you then have a roughly 50/50 chance each turn to trigger this abilitys condition, and its very much worth it
Youll want to make sure you have enough high-impact spells in your deck to cast with Chimil, the Inner Sun
Other Versions For Sale Base - $9.12 Borderless - $14 Borderless Foil - $19 Showcase - $22 Prerelease Foil - $16 9 Narset, Jeskai Waymaster Showcase Ghostfire Halo Foil - $40.20 Narset returns once again in Takir: Dragonstorm, although not as a planeswalker, and instead as a legendary creature, which means there are now more Narset creature cards than planeswalkers