Sword or Rust and Rot

Equipped creature gets +2/+2 and has protection from artifacts and from enchantments. Whenever equipped creature deals combat damage to player, place X Decay counters on an artifact or enchantment defending player controls where X is the damage dealt.

Whenever equipped creature deals combat damage to creature, if the other creature was defending, that creature loses it's abillities and becomes a land with {t}{c}.
If the other creature was attacking, that creature loses it's abillities and becomes an