Teferi, Warden of Time

+2: Exile the top card of your library witth X time counters, where X is its converted mana cost. If it doesn't have suspend, it gains suspend.
-1: Create a colorless Clock artifact with "Sacrifice this artifact: Scry 1." Scry X, where X is the number of Clock artifacts you control.
-10: For each Clock artifact you control, sacrifice that artifact, then you get that many extra turns after this one.