Bestow {W}{W}{W}{W}{W} (If you cast this card for its bestow cost, it's an aura spell with enchant Construct creature. It becomes a creature again if it's not attached to a creature.)

Enchanted creature gains +4/+1.

Totem Armor (If enchanted creature would be destroyed, instead remove all damage from it and destroy this aura.)

If A-Assault Core is sent from the field to the graveyard: put target Construct creature with converted mana cost 4 or less from your graveyard, except this card, into your hand.