Cannot Activate Artifacts
Once controlling a large amount of artifacts, activated of non-mana producing artifacts cannot be activated. This happened when trying to combo off with Aetherflux Reservoir. I had over 50 life, but could not activate the artifact for reason. The same goes for Mystic Forge. I could not pay the 1 life, despite having it available. It was. not a broad state issue, as I was able to activate Mystic Forge earlier in the combo. Once I had three screens worth of artifacts, I could no longer activate non-mana artifacts. Mana-artifacts like mind stone still work. The creature modes of Guardian Idol still worked as well. I lost a ranked game as a result.
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EvergreenOldboy#37158 commented
Figured it out. It was my own Karns Sylex
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[Deleted User] commented
That sounds like there was a Yasharn on the field?