Karn missed trigger
Karn guided guardian did not trigger when i cast him on turn 5. I opened the game with leyline of the guildpact in play, turn two i played Case of the shattered pact(which is an artifact that is now every color due to leyline of the guildpact). Tam did give karn hexproof from every color, and dragonfire blade did equip for 0(which was also every color). Karns draw cards ability simply did not work with multiple 5 color artifacts on the battlefield
AgentStainless#79285
shared this idea
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Rezzahan#77802
commented
Case of the Shattered Pact is NOT an artifact. It is an enchantment, and usually a colorless one.
That Dragonfire Blade seems to be the only other artifact you had. Impossible to tell what is going on from your screenshot, as you showing Karn blocks most of the battlefield.
An unobstructed view of the play area is way more important than showing the card or cards you are concerned about. Those can easily be looked up, the game state cannot.