Like all the modal DFCs, just having the option for a tapped land, or an untapped land for cost, is quite powerful.
The open seas are ripe for the taking in Disney Lorcanas Azurite Sea, and there is plenty of treasure to dig up
Generating Whole Sets Generating individual cards works well, but I want to be able to generate entire sets of Magic cards that will play well together
Then Kotis has a combat damage trigger for his damage to exile that many cards from their library and then cast them for free, just like Narset
Brallin, Skyshark Rider lets you deal incremental damage while Shabraz, the Skyshark gives you lifegain and can fly over blockers for commander damage
Against fair decks this is well worth it but against a combo deck where it is just a pure race this massive momentum swing can be too late