The 6-cost mana value is no problem for a deck focused on lands or slow pacing, and the upside of a huge body and landfall triggers is incredible
While that was acceptable back then, gaming has evolved to the point where a product needs to be visually attractive or user-friendly for players to want to engage, and by todays standard MTGO doesnt exactly check either box
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An easy way to use this is to stop a Trap Card the opponent activates and then shuffle it right back at the deck
Hard counters are very powerful against Ramp for this reason
This means you cant use Gyruda, Doom of Depths as your companion in a deck where your commander has an odd mana value, even if all the cards in your main deck have an even mana value