scrapyard juggernaut

this gains +1/+1 for each common, uncommen
and rare artifacts in your graveyard and +3/+3
and trample for each legendary and mythical artifacts in your graveyard.
when this dies play 3 artifact creature tokens with banding and either deathtouch (1), flying (2), hexproof (3), lifelink (4), vigilance (5) or first strike (6). this is chosen randomly for each artifact creature token by roling 3 six sided dice.