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I do like the effect too, where the Primordial Ooze mindlessly attacks, mindlessly grows, and you have to keep pumping mana into it (more mana as it grows, too!) otherwise it'll turn around and attack you

Since our deck is already overloaded with ramp and massive threats to support Random Encounter, Improvisation Capstone gives us another way to cheat something massive into play for free, and thanks to paradigm it can do it every single turn for free once it gets going

Here are the suggested replacement lands: Xander's Lounge Watery Grave Blood Crypt Steam Vents Graven Cairns Cascade Bluffs Sunken Ruins Morphic Pool Training Center Luxury Suite Shipwreck Marsh Haunted Ridge Stormcarved Coast City of Brass Reflecting Pool Mana Rocks Suggested Cuts : Basalt Monolith, Worn Powerstone, Commander's Sphere You can also replace some mana rocks from the list with better ones

This format was slowly banished from paper Magic, but its still very alive in MTGO