Gemstone Mine [Weatherlight] Eighth Edition {T}: Counter target activated ability

{T}: Counter target activated ability from an artifact source unless that ability's controller pays {W}

{1}: Target noncreature artifact becomes an artifact creature with power and toughness each equal to its converted mana cost until end of turn

(It's an artifact with "{T}

As Breeding Pool enters the battlefield

One razorclaw is three bears too many

Gemstone Mine [Weatherlight] Eighth Edition {T}: Counter target activated abilitySet: Weatherlight Type: Land Rarity: Uncommon Gemstone Mine enters the battlefield with three mining counters on it. {T}, Remove a mining counter from Gemstone Mine: Add one mana of any color. If there are no mining counters on Gemstone Mine, sacrifice it.