Every typal deck wants Urza's Incubator, so it demands a high price
I especially like the Swamp with the dragon carcass, and the Wastes
The combo can be executed with only a few cards, which makes it quite simple as well: Cast Venture Deeper , targeting your opponent Cast Merfolk Secretkeeper from adventure zone Cast Ashnods Altar Cast Chromatic Orrery to turn colorless mana into blue mana Cast Lier, Disciple of the Drowned from the commander zone Sacrifice Merfolk Secretkeeper , using Ashnods Altar Cast Venture Deeper from graveyard, using Liers ability Repeat this cycle infinitely until your opponent mills all their cards in a single turn using the mana produced by Ashnods Altar and Chromatic Orrery
Because damage remains marked on a creature until the damage is removed as the turn ends, nonlethal damage dealt to a Cat you control may become lethal if Feline Sovereign leaves the battlefield during that turn
Effects like Tectonic Instability and Price of Glory force action from your opponents on their turn, making them effectively play at sorcery speed or suffer the consequences
Its a bit back on the list because it does guzzle mana like a thirsty duck in a desert
