Otarian Juggernaut

Otarian Juggernaut

Artifact Creature - Juggernaut | Power/Toughness: 2 / 3 (CMC 4)
Otarian Juggernaut can't be blocked by Walls.
Threshold -- As long as seven or more cards are in your graveyard, Otarian Juggernaut gets +3/+0 and attacks each combat if able.