Goblin Key enters the battlefield tapped.
: Add or to your mana pool.
: Add to your mana pool. Put Goblin Key on top of your library.
: Goblin Key becomes a 1/1 blue and red Troll creature with first strike until end of turn. It's still a land.
: Add 
or 
to your mana pool.: Add 
to your mana pool. Put Goblin Key on top of your library.
: Goblin Key becomes a 1/1 blue and red Troll creature with first strike until end of turn. It's still a land.
