Beholder's Sleep Ray - Stifle [Secret Lair Drop Series] Event if that creature was destroyed

if that creature was destroyed this way

Once a barbarian army has conquered a region

Set: Mirage Type: Artifact Rarity: Rare Cost: {0} Discard your hand

Set: Wilds of Eldraine Commander Type: Artifact Rarity: Rare Cost: {2}{U} Flash

It drinks fatigue

Beholder's Sleep Ray - Stifle [Secret Lair Drop Series] Event if that creature was destroyedSet: Secret Lair Drop Series Type: Instant Rarity: Rare Cost: {U} Counter target activated or triggered ability. When purchasing this unique product, please keep in mind that this card only appears in the Secret Lair Dungeons & Dragons 50th Anniversary Superdrop and will ship out to you after the seller receives the product directly from Wizards of the Coast. The estimated time frame for sellers to receive stock is not fixed, so it could be anywhere