Golgari Keyrune - Return to Ravnica Spoiler

Golgari Keyrune

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Tap Symbol: Add Red Mana or Green Mana to your mana pool.

Red ManaGreen Mana: Until end of turn, Golgari Keyrune becomes a 2/2 black and green Insect artifact creature with deathtouch.

Like a single ant it only hints at the colony below.