In order for Draft to function properly, the cards within the pack needed to cater to that format
Collective Defiance deals 3 damage to target opponent
Your particular style of assassin deck might not find all of these cards to be equally useful
The theory is that, as Yedora3 brings back non-token creatures as face down and lands, the ability does not remove the interaction between Morph or disguise and being face down - I can morph in a creature, turn it face up for effect, throw it at the enemy to get it killed, bring it back as a face-down card that is a forest, then flip it face up (again) for its morph cost
You can look at the top card of your library and cast them anytime by also sacking a nonland permanent, plus their costs too
Domain is a mechanic that counts the number of basic land types in play