Yes, when you cast a disguised creature face-down, it has summoning sickness
Even if you just tick it down to force some sacrifices and draw cards, thats killer on certain board states
Kaladesh had compounding factors, namely that energy was a complicated new mechanic with several costs having been misjudged, but had the designers been able to easily slap colored mana costs on most of the artifacts without tradition turning them away, things could have been different
Thanks to this, all the historic support works very well together, and even though all the Doctors have different designs and playstyles, they all mesh together for a solid Bant precon that's great out of the box
Over the last five years, Cryptolith Rite has increased significantly in value, being propelled by EDH play and lack of reprints
Mufasa - Ruler of the King's Rock (V.2) Mufasa is the crown jewel of the "Skylight" set