It's worth pointing out that the creatures Olivia brings back don't need her to remain in play, just any other Legendary vampire
Then Commander Legends: Battle for Baldurs Gate came out, one of my all-time favorite sets for Commander goodies, and it had a huge Dragon element that marked a great time to overhaul my The Ur-Dragon deck and just jam a bunch of Dragons
Revised Dual Lands They might not be one card, but financially they move as a group, so lets start off the list with a bit of a bonus
Then in your EOT if you have delirium you can exile four or more cards types and drop one to the battlefield with a finality counter
If it's attached to a Pokemon that isn't a Fusion Pokemon, discard this card
One popular strategy is eggs, artifacts which provide value when sacrificed or cracked