Tezzeret, Bolas's Herald

: When Tezzeret, Bolas's Herald enters the battlefield, surveil X and up to X target artifacts become 2/2 Artifact creatures.
+1: Add 2 mana of any one color, then you may reveal a Bolas planeswalker from your hand. If you do, draw a card.
-8: Search your library for up to 3 Planeswalkers and put them onto the battlefield. Then Artifacts you control get +5/+5 until end of turn.