While you took those cards out of your opponent's deck, you didn't actually diminish their available resources
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When it comes to Vivid's strength, you have to ask yourself how good an effect is going to be given N=2, as this is going to be typical for both Constructed and Limited
Just be sure you have some diversity of permanents, fetch lands, etc., so you can trigger Delirium
War of the Spark Mythic Edition is limited to only 12,000 units (Limit 2 per person)
This extra toughness made Tradewind Rider nigh unkillable, and once it hit the board, it could completely dominate for all the reasons that reusable bounce dominates limited games as outlined above