The card can be very hard to activate and smart players will try their best to play around it, thats why I think 1 is all you need
On the other side of the coin, losing access to green cuts off a lot of great cards in commander, including many that play specifically well in cascade decks: One big advantage Abaddon the Despoiler has over Yidris is that the cascade ability can trigger without needing Abaddon to attack and deal combat damage
I will try and post the cert numbers of what I have here to cover NR base and QSS
If that half has any abilities that trigger "when you unlock this door," those abilities trigger at that time
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Red has always been weak in the card selection and advantage department, which explains why some of the most popular red cards in Commander are Windfall Its a Miracle