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But giving a definitive place for cards like Ninja of the Deep Hours, Tetsuko Umezawa, Fugitive, and Dimir Infiltrator to thrive was a master stroke, in my opinion, legitimizing a fifteen year old tribe
Lets break them down in detail
Each one has the artifact subtype Vibranium, has indestructible, and has ": Add
I experimented with a variety of ideas for the mana fixing, from including a copy of every common fixer I could find (Evolving Wilds, Prophetic Prism, etc.), to allowing player to grab two untapped duals from the basics box, to just putting 30 Prismatic Vista in there
Summoning sickness doesnt matter, either