This might sound simple enough, but it has a complicated background and various effects on how the game is played today
Sure, the rate isnt exactly great for a creature, but what youre really paying for is the ability to negotiate for a repeatable Lightning Bolt at the best creature on the table each turn
Mishra's Bauble, one of the best eggs in Magic, isnt as broken, but being a 0-mana cantrip (even if the card draw is delayed) makes it a mainstay in Vintage and Modern
Kibo, Uktabi Prince is the latest in a long lineage of Magic's Monkeys and Apes that love destroying artifacts
The massive card flow that people want for free in Commander and multiplayer lead them to attack each other, but not you, especially since they don't have to spend a card to get the card draw, so for them, this is free card advantage over time for each foe that attacks each other, and you'll draw more than the card it took to cast him in one or two turns