@wiley even at a cost that includes tapping and paying a mana these would be playable, I hoped for such a card in BFZ. I'm mostly looking at it in terms of dredge, but being unspherable and uncounterable is a scary thing. They suffer the phyrexian mana problem where any deck can play them- imagine shops with these to kill null rod or oath. Basic land types on top of that is just gravy. Stifle, etc are legal but can never be as prominent or always online as force of will/misstep which hit normal spells. Teferis response has no relation to this.