If the choice is between Emrakul and, say, Charming Prince, you will always end up with the Emrakul because the Prince can flicker it back to its owners side of the field
Desert Warfare is incredible for recycling deserts and looks to give you value whether you sacrifice, cycle or self-mill your deserts
At 4 mana cost the only drawback here is this is a creature itself, and thus easy to remove
Mizzixs Mastery is much more niche, really only seeing play in casual spellslinger decks in Commander
There used to be a deeper focus on complex advantages in combat, but not so much anymore
Any time one or more permanents would be phased out or anytime a card is put into exile, The War Doctor gets a time counter