For eight mana, this is a white sorcery that destroys all creatures
23 Lonis, Cryptozoologist Get A Clue For the low cost of two mana, Lonis, Cryptozoologist is a commander who allows you to convert your creatures into an impressive value engine, investigating (creating clue tokens) whenever another nontoken creature enters the battlefield under your control
It occasionally shows up in tournaments but is far from a consistent presence
Opening up access to blue lets you use Sakashima of a Thousand Faces to quadruple your tokens by copying your commander, top notch card draw, and powerhouse spells like Cyclonic Rift to clear the path for your token army
The problem is that four-mana sorcery-speed creature pumping just isn't constructed playable
If an effect causes the top card of the library to be face up, the second card down is not revealed.