Some permanents have activated abilities that help you to draw cards (Shorikai, Genesis Engine, Dimir Guildmage)
He was a great sage and could perceive events well before other, more short-lived races became aware of them
Spider-Punk is best built as an aggro deck, and Ghost-Spider helps to deliver extra burn damage whenever it attacks
Although white has much better options, Generous Gift is solid (and cute!) enough to be very popular in Commander and Pauper
For example, if you control a 2/2 creature with evolve and a 1/3 creature you control enters , its toughness is greater, so evolve will trigger
Virtually every color has some kind of spell that spits out tokens, and there's plenty that are ETB creatures themselves