Cain Kahn, War Machine

0: Discard 2 cards, draw a card. Instead, if you control 3 artifacts, Scry 2, draw a card and add 1 loyalty counter to all Planeswalkers you control
-1: All historic spells you cast have flash, affinity, and improvise until the beginning of your next turn, create clue and treasure token.
-7: Create X (Karn)struct creature and X 1/1 flying thopter tokens. Then deal X damage to any number of targets, X is the total of all artifacts.