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Abilities like the one our little mushroom friend has check to see if you've descended that turn to determine whether they trigger
He also works brilliantly with his Companion Amy Pond, who has to get in for damage and can then remove that many time counters from a suspended card
Blue loves to draw cards, and White loves its tiny tokens, so Shorikai finds the happy medium and gives you both
It was so good it was quickly banned, and remains to this day illegal in Modern and Legacy
Paying 10 mana to untap all your lands is a pretty dangerous ability to try and use in Standard, but in Commander you've got a lot more life to work with and can potentially leverage this effect in a lifegain deck for tons and tons of ramp