Most notably, if a triggered ability asks its controller to pay a cost, you pay that cost for the copy if you wish to have it paid
If you cast a creature spell this way, it gains haste until you lose control of that creature (or, in rare cases, you lose control of the creature spell while its on the stack)
(This effect lasts indefinitely.) Illustrated by Quinton Hoover Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp
Theres also a Planechase tie-in here
These effects are a lot more useful for when youre just trying to empty your hand and draw seven new cards repeatedly.Due to graveyard hate, you most likely need a back-up plan other than just Echo of Eons
Sylvan Library Sylvan Library is a funny little card given that the text box belongs on a black card