Creatures that cost ten mana: Both old and new Kozilek sit at ten mana
(in this case having your early game plan consist mostly of cycling effects and other cards with high CMC that can affect the game for less mana than they actually cost.) The only difference is that instead of winning the game instantly when you cast Primal Surge, you just die when you cast Belzenlok
We play the Elves to ramp towards Erhnam Djinns but also to cast bigger Fireballs early
Arwen, Weaver of Hope Arwen, Weaver of Hope makes it so that each creature you cast comes with an extra +1/+1 counter, and that can get better with typal elf incentives and equipment
Beyond just being fun, Sire of Seven Deaths is also incredibly powerful, packing a serious punch even when removed
It's even possible to play a second Shahrazad in the subgame to create Magic -ception