Event Hourglasses, for example, are tied to specific limited time events and disappear at the conclusion of those events
Siege-Gang Lieutenant chips in as a much costlier substitute, but if you need to deal that final damage and can't squeeze another attack in, it'll do the job
The token copies exactly what was printed on the original creature, with the listed exception (unless that creature is copying something else or is a token
Hermit Druid, Life from the Loam, Entomb, Buried Alive, Faithless Looting, Wheel of Misfortune, Frantic Search, and Bazaar of Baghdad are all great ways to do the former
There are roughly 300 cards, including Bulbasaur, Sizzlipede, and Zapdos