many Zombie effects and Zombie support involve sending Zombies from the Deck to the GY, summoning Zombies from the GY, or banishing Zombies from the GY for other effects
This is a pretty decent effect since it can act as both an interruption and a way to reset your opponents play
WotCs R&D always receives questions about when youre going to complete said cycle. As an example, we can cite the 1-mana tutors that tutor for a card and put it on top, like Vampiric Tutor, Worldly Tutor, Enlightened Tutor, and Mystical Tutor, lacking the red one
Rare prints make it a chase card, so its a tournament threat and a grail for serious collectors
There are plenty of creatures that become much stronger when they can use their activated abilities multiple times, and you can also copy Maxs ability with cards like Strionic Resonator to untap multiple creatures on a turn
Thankfully this issue can be mitigated with cards such as Narset, Parter of Veils