Various doors offer unique abilities like mana fixing or creature resurrection
They will appear inside the Collector Booster 1% of the time
For example, Cayth, Famed Machinist will enter the battlefield as a 3/3 creature, then its fabricate ability goes on the stack
I imagine burn spells are some of the hardest to design for R&D Yea, Factory and Pendlehaven remain the two most walked into on the board "tricks" as it were
If we can stop their Griselbrand from drawing cards, we have more than enough ways to remove their threats from play before they can actually attack us for lethal
#3: Sea Gate Oracle Sea Gate Oracle isn't flashy but offers a ton of value with a Naban, Dean of Iteration on the battlefield by drawing two cards but actually being more like a Read the Bones than a Divination, since you get to choose the best of your top two cards twice