I really like the ones you mentioned, seems great Vorthos targets for the Lich, a so much valuable object like the Crown it's perfect target haha Following the "empire" cycle you mentioned: Hand of Vecna, Eye of Vecna and The Book of Vile Darkness seem great and flavour objectives
You can't stop a Teferi, Time Raveler, though
X Speed can also help both Mew ex and Koffing retreat for free, which will be a bit more energy efficient than picking them back up
Creature - Elemental Color tag templates(None) Mirror-Sigil Sergeant Trample At the beginning of your upkeep, if you control a blue permanent, you may create a token that's a copy of this creature
If first non-Lemur creature spell with flying you cast on your turn doesn't have generic mana in its cost, the cost will not be reduced and the cost reduction will not apply to the next spell you cast that turn