Spire Serpent
Mirrodin Besieged — common
Creature — Serpent
Spire Serpent rulings:
2011-06-01: Spire Serpent still has defender if you control three or more artifacts, although it will be able to attack.
2011-06-01: If Spire Serpent has been declared as an attacker, and you stop controlling three or more artifacts later in combat, Spire Serpent continues being an attacking creature until combat ends.