With Rayami around, you get graveyard hate by exiling the creatures, and you can play a hefty amount of creature removal to boost it
If they play one, thats fine, but that one had better be Elixir of Immortality, because otherwise I can use Kolaghans command to make her discard Elixir
Don't forget the aforementioned cards such as Pharika's Chosen and Agent of Erebos, and you have a solid Wrath variant (Extinguish All Hope), a spell version of Mindslaver (Worst Fears), another Nightmare variant (Squelching Leeches), and a fun commander (King Macar, the Gold-Cursed)
For example, if the original creature spell had kicker and its kicker cost was paid, the copy will also be kicked
When Contagion Engine enters the battlefield, it automatically adds a -1/-1 counter to each creature a target player controls
Teferi, Timebender The simplicity on Dominaria s Teferi, Timebender is welcome and I love the versatility of the first ability, but 6 is a lot to pay for that first untap