Shockwave, Logical Firepower

Living metal, haste

Whenever Shockwave attacks, two target players
may discard a random card. For each player who discarded this way they draw a card and lose 2 life.
For each player who didn't discard this way put a
+1/+1 counter on each other legendary artifact you
control. If two or no cards were discarded this way convert Shockwave then you may convert another
target artifact you control.