Karn, Unbound

: 5: Create a 0/0 colorless construct with this creature has +1/+1 for each artifact in play". 4: put a kind of counter on target artifact.
+3: Exile the top card of target players deck and create 2 colorless 1/1 sevos. You may play that card. Then you may pay 3. if you do, draw 2 cards.
-15: Gain control of all permanents target player controls. They are artifacts in addtion to other types.