You can then play lands and cast spells from their hand
With the right hand I could be getting it out on turn one and then using its -3 ability to search for a Mana Vault, Commanders Plate, or, if you want the real big-brain play, grabbing a Clown Car and casting it to make enough artifacts to fill Tezzerets loyalty right back up
One way to do that is to Connive each turn, but thats such a slow process that they might as well have left the ability out
If you click a card, it removes it from the deck
It shouldnt be any surprise that people are often confused by exactly how these abilities work, so well go over some examples of cards that do and dont work well with turn-ending effects
Even outside of Standard, Vivi Ornitier is great in Commander as well, both in the 99 and as a commander itself with cEDH playability