Mewtwo & Mew-GX, as well as all Tag Team Pokemon, are considered Basic, meaning it lets you get to them incredibly quickly
For reference, that's 85 booster boxes at retail price (or 27 Destined Rivals booster boxes at current market price, yuck)
Because N's Zoroark discards a card to draw 2 cards, it can also be used as an incredible draw engine
This is a great way to protect an important permanent from removal by bouncing it before it's removed, or to reuse a powerful enter-the-battlefield trigger
Even if you use Rhongomiant, The Six Samurai or Terranite can be used well
Furthermore after Vetrix tested his new obtained power, he learned from Quinton that Yuma Tsukumo possesses the "Original Number"