They also include one common or uncommon with a variant treatment, two wild cards (anything from common to mythic), one guaranteed rare (with a roughly 13% chance of being a mythic), one foil of any rarity, and one marketing or token card
On the other side, Tibalt, Cosmic Impostor is a seven -mana planeswalker
The number of board wipes you should run varies widely based on your general strategy
Ketramose, the New Dawn Ketramose, the New Dawn requires more effort to build around than other options on this list, but it has access to so many cheap cards that easily wrack up triggers, like Ghost Vacuum and Relic of Progenitus
So far my experience is, that exiling the whole grave and multiple cards per turn (Lion Sash and Scavenging Ooze) is too much