The pirates had ventured into the interior for treasure. They found something far greater.

Dowsing Dagger // Lost Vale

(Transforms from Dowsing Dagger.)
{T}: Add three mana of any one color.

When this Equipment enters, target opponent creates two 0/2 green Plant creature tokens with defender.
Equipped creature gets +2/+1.
Whenever equipped creature deals combat damage to a player, you may transform this Equipment.
Equip {2}

The List

XLN Treasure Chest

Ixalan

When Dowsing Dagger enters the battlefield, target opponent creates two 0/2 green Plant creature tokens with defender.
Equipped creature gets +2/+1.
Whenever equipped creature deals combat damage to a player, you may transform Dowsing Dagger.
Equip {2}

Ixalan Promos

Attacking with an equipped creature doesn't cause Equipment attached to it to become tapped. Dowsing Dagger will normally be untapped when it transforms into Lost Vale.