This combo clears the entire board, then returns all of the Meditation player's permanents back to play
Cliffs of Contradiction Plane: Inversia When you planeswalk to Cliffs of Contradiction, or at the beginning of your upkeep, manifest the top card of your library

Urza Poly Kraken Urza, Lord High Artificer | Illustration by Grzegorz Rutkowski Commander (1) Planeswalker (2) Narset, Parter of Veils Tezzeret the Seeker Creature (1) Instant (20) Brainstorm Counterspell Cyclonic Rift Delay Dig Through Time Dispel Dramatic Reversal Flusterstorm Force of Will Mana Drain Mental Misstep Muddle the Mixture Mystical Tutor Narset's Reversal Negate Pact of Negation Rapid Hybridization Sink into Stupor Swan Song Whir of Invention Sorcery (11) Fabricate Gitaxian Probe Merchant Scroll Personal Tutor Polymorph Ponder Recurring Insight Solve the Equation Time Spiral Timetwister Transmute Artifact Enchantment (6) Back to Basics Copy Artifact Counterbalance Mystic Remora Power Artifact Rhystic Study Artifact (28) Aether Spellbomb Basalt Monolith Codex Shredder Everflowing Chalice Grafdigger's Cage Grim Monolith Isochron Scepter Jeweled Amulet Lotus Petal Mana Vault Manifold Key Mishra's Bauble Moonsilver Key Mox Amber Mox Diamond Mox Opal Pithing Needle Proteus Staff Rings of Brighthearth Sapphire Medallion Sensei's Divining Top Sol Ring Static Orb Tormod's Crypt Torpor Orb Trinisphere Voltaic Key Winter Orb Land (31) Blast Zone Inventors' Fair Island x23 Misty Rainforest Mystic Sanctuary Scalding Tarn Seat of the Synod The Tabernacle at Pendrell Vale Urza's Saga My personal favorite deck is also the one Im currently playing most: Urza, Lord High Artificer, possibly Magic's best artifact commander

Now, just a few short years later, I see serialized cards show up in my Twitter and Discord feeds on a monthly (if not weekly) basis
One things for sure: You might not want to swim in the open ocean after this
The ability creates tokens for each opponent other than the defending player