Pricing cards Since the card economy on MTGO mirrors the paper economy, I would price cards the same way: Find an agreed-upon site to base prices on
Lotus Cobra generates a silly amount of mana, Tatyova, Benthic Druid draws a crazy amount of cards, and Avenger of Zendikar becomes an instant game-ender
That's already a draw engine in itself, but Tamiyo, Seasoned Scholar pushes it further by nerfing creature attacks and rebuying instants and sorceries from your graveyard
Long story short, eBay, TCGPlayer, and the like all take a cut from your sales
It doesnt count separately from the creature itself, nor is it some other spell you have to cast
There is no going bigger than an Omniscience combo kill and that happening reliably on Turn 4 is too strong for Standard