Like Megazowler, Sword Arm of Dragon was first available in the OCG much earlier through vending machine booster packs, specifically December 1999's Booster Pack 6
I want my opponent to make their commander have 60 power and then see if I can cobble together a way to win despite that
They'll always create a Golem and give them some ability
These days, most of the times I have a Sarkhan the Mad out its been because its in my Cube deck, but I really do appreciate the design of this card

Here are the 6 fathomless descent cards: Chupacabra Echo Matzalantli, the Great Door / The Core Song of Stupefaction Souls of the Lost Squirming Emergence Terror Tide Here are the 18 descend X cards: Akawalli, the Seething Tower Basking Capybara Bygone Marvels Chitinous Crawler Coati Scavenger Council of Echoes Didact Echo Echo of Dusk Frilled Cave-Wurm Join the Dead Malamet Veteran Starving Revenant Stinging Cave Crawler The Ancient One The Everflowing Well / The Myriad Pools Uchbenbak, the Great Mistake Wail of the Forgotten Waterlogged Hulk / Watertight Gondola Here are the 12 cards that check if you've descended this turn: Brass's Tunnel-Grinder / Tecutlan, the Searing Rift Broodrage Mycoid Canonized in Blood Child of the Volcano Corpses of the Lost Deep Goblin Skulltaker Enterprising Scallywag Molten Collapse Ruin-Lurker Bat Stalactite Stalker The Mycotyrant Zoyowa Lava-Tongue Best Descend Cards #7
Cards like Six and Exploration Broodship also work