No one can try to destroy the creature you sacrificed to prevent you from casting this spell
Hes really good at holding equipment such as Sword of Hearth and Home or Umezawas Jitte to get extra triggers when he deals damage, but you can also use him to tutor up Skullclamp in your tokens deck and then immediately equip it to him to draw four cards when he dies
While theres a lot of synergy here, the cards are mostly strong independently, and the deck is designed to play a fair, interactive game that just happens to be able to gain infinite life with Urza and the Thopter Foundry / Sword of the Meek Combo, but mostly Urza, Oko, and Emry are all amazing standalone cards that require fairly different answers
Each Aura and Equipment that phases out attached to a permanent that's phasing out phases in with that permanent and is still attached to it
If you have a high density of Creatures in your deck, this is a cool way to generate a bunch of tokens at once
That means if someone casts a ten-mana spell, they are going to be milling ten cards on their next untap step