With this in effect, an Elf deck will draw lots of cards, and that even includes creature tokens, not to mention enchantments
Having a stronger early game blocker than search up a specific Spider Hero that synergizes with your deck is great, and functions like a little toolbox effect if you build around it more
Eight mana for a 5/5 flying, lifelink, haste, exalted creature is fine, but being able to convoke this onto the board faster thanks to your army of vampires makes this a fun bomb to drop
(I skipped Onslaught .) And Mirrodin
This is a commander for people who want to cast crazy spells off the top of their deck
At its floor, this card can probably hit most of your opponents for a few damage and make a handful of treasure in almost every Commander game