Its as if they died of old age, I guess
If you cast Mind Control targeting the relic, as soon as the Relic falls under your control, it stops being a creature, and therefore, Mind Control can no longer enchant it
As much as the rules and structure of the format, individual cards tell the story of Commander
Even if you don't have enough Treasure tokens to win the game, Revel in Riches is also a great ramp tool
After that point, a gust of wind removing your hat or blowing a new hat onto your head won't change which blockers have already legally been declared
These are both control decks, but the UB (blue-black) deck is more dedicated to the control game plan, opting for extra counterspells where the Sultai (black-green-blue) deck has Satyr Wayfinders and more Planeswalkers