Flak Missile

Weapon equipment — Uncommon

Your Flak Scrappers instead have, "Deploy - You may sacrifice up to two artifacts you control. If you do, this deals 2 damage to target champion or troop for each artifact sacrificed this way."

Changes: Flak Scrapper
Slot: Weapon
Rarity: Uncommon
Set: Shattered Destiny
How obtained: Set 2 Chest Loot

What it does is the game's own text; how it was obtained is from the owner's records.