Predictably, paying even for a one-shot influx of one mana was busted, and this card remains restricted in the ultra-powerful Vintage format due to that fact
Lovisa Coldeyes You have to love a versatile card with multiple options for typal builds

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

The initial Pokmon cards were not translated into Korean, which hindered their popularity Differences from Other Regions Korean Pokemon cards have several distinctive features: Language : Text is in Korean, using Hangul script
Thus echo was pushed off for a future set which would be Urza's Saga block a year later
(Edit: Ive also been told this one is potentially real)