Aggron

You may sacrifice a creature named Lairon rather than pay this spells mana cost.
Trample, last strike, absorb 3.
Aggron can't have -1/-1 counters placed on it.
Whenever Aggron is dealt damage for the first time each turn, prevent that damage.
{c}{c}: Aggron assigns combat damage equal to its toughness rather than its power until end of turn.
Metalcraft — Artifact Creatures you control gets +2/+2 and have vigilance, as long as you control