The deck even has an infinite combo included in it with Walking Ballista, Hardened Scales, and Gatta and Luzzu
One may be rarer than the other but thats not really what distinguishes them to me
Narset of the Ancient Way is probably the best option: while she incentivizes casting spells over cycling them, her minus ability allows you to draw extra cards with the option to discard them to damage your opponents creatures, or to keep them and cycle them later
(It can't be the target of spells or abilities.) Equipped creature can't be blocked
More and more Magic cards are printed every year, and in 2021, with fresh Commander decks for each Standard set, the Modern Horizons sequel, the new digital-only Alchemy cards, and so much more, we're now firmly at a point where keeping up with everything is downright daunting
In other words, you can put 5 counters on The Ur-Dragon, but you don't win the game that way